Webster's Dictionary, 1913

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Hypophyllous adjective [ Prefix hypo- + Greek ... leaf.] (Botany) Being or growing on the under side of a leaf, as the fruit dots of ferns.

Hypophysial adjective (Anat.) Of or pertaining to the hypophysis; pituitary.

Hypophysis noun [ New Latin , from Greek ... under + ... nature, origin.]
1. (Anat.) See Pituitary body , under Pituitary .

2. (Medicine) Cataract.

Hypoplastron noun ; plural Hypoplastra . [ Prefix hypo- + plastron .] (Anat.) The third lateral plate in the plastron of turtles; -- called also hyposternum .

Hypoptilum noun ; plural Latin Hypoptila , English Hypoptilums . [ New Latin , from Greek "ypo` beneath + ... down.] (Zoology) An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called also aftershaft . See Illust. of Feather .

Hyporadius noun ; plural Hyporadii . [ Prefix hypo- + radius .] (Zoology) One of the barbs of the hypoptilum, or aftershaft of a feather. See Feather .

Hyporhachis noun ; plural Hyporhachides . [ New Latin , from Greek "ypo` beneath + ... spine.] (Zoology) The stem of an aftershaft or hypoptilum. [ Written also hyporachis .]

Hyposkeletal adjective [ Prefix hypo- + skeletal .] (Anat.) Beneath the endoskeleton; hypaxial; as, the hyposkeletal muscles; -- opposed to episkeletal .

Hypospadias noun [ New Latin , from Greek "ypo` beneath + spa`n to draw, tear.] (Medicine) A deformity of the penis, in which the urethra opens upon its under surface.

Hypostasis noun ; plural Hypostases . [ Latin , from Greek ... subsistence, substance, from ... to stand under; ... under + ... to stand, middle voice of ... to cause to stand. See Hypo- , and Stand .]
1. That which forms the basis of anything; underlying principle; a concept or mental entity conceived or treated as an existing being or thing.

2. (Theol.) Substance; subsistence; essence; person; personality; -- used by the early theologians to denote any one of the three subdivisions of the Godhead, the Father, Son, and Holy Spirit.

» The Council of Alexandria ( a.d. 362) defined hypostasis as synonymous with person . Schaff- Herzog.

3. Principle; an element; -- used by the alchemists in speaking of salt, sulphur, and mercury, which they considered as the three principles of all material bodies.

4. (Medicine) That which is deposited at the bottom of a fluid; sediment.

Hypostasize transitive verb To make into a distinct substance; to conceive or treat as an existing being; to hypostatize. [ R.]

The pressed Newtonians . . . refused to hypostasize the law of gravitation into an ether.

Hypostatic, Hypostatical adjective [ Greek ...: confer French hypostatique .]
1. Relating to hypostasis, or substance; hence, constitutive, or elementary.

The grand doctrine of the chymists, touching their three hypostatical principles.

2. Personal, or distinctly personal; relating to the divine hypostases, or substances. Bp. Pearson.

3. (Medicine) Depending upon, or due to, deposition or setting; as, hypostatic cognestion, cognestion due to setting of blood by gravitation.

Hypostatic union (Theol.) , the union of the divine with the human nature of Christ. Tillotson.

Hypostatically adverb In a hypostatic manner.

Hypostatize transitive verb
1. To make into, or regarded as, a separate and distinct substance.

Looked upon both species and genera as hypostatized universals.
Pop. Sci. Monthly.

2. To attribute actual or personal existence to. Sir W. Hamilton.

Hyposternum noun ; plural Latin Hyposterna , English Hyposternums . [ Prefix hypo- + sternum .] (Anat.) See Hypoplastron .

Hypostome Hy*pos"to*ma noun [ New Latin hypostoma , from Greek "ypo` beneath + ... mouth.] (Zoology) The lower lip of trilobites, crustaceans, etc.

Hypostrophe noun [ New Latin , from Greek ..., from ... to turn round or back; ... under + ... to turn.] (Medicine) (a) The act of a patient turning himself. (b) A relapse, or return of a disease.

Hypostyle adjective [ Greek ... resting on pillars; ... under + ... a pillar.] (Architecture) Resting upon columns; constructed by means of columns; -- especially applied to the great hall at Karnak.

Hyposulphate noun (Chemistry) A salt of hyposulphuric acid.

Hyposulphite noun (Chemistry) (a) A salt of what was formerly called hyposulphurous acid; a thiosulphate. [ Obsolete] (b) A salt of hyposulphurous acid proper.

Hyposulphuric adjective [ Prefix hypo- + sulphuric .] (Chemistry) Pertaining to, or containing, sulphur in a lower state of oxidation than in the sulphuric compounds; as, hyposulphuric acid.

Hyposulphuric acid , an acid, H 2 S 2 O 6 , obtained by the action of manganese dioxide on sulphur dioxide, and known only in a watery solution and in its salts; -- called also dithionic acid . See Dithionic .

Hyposulphurous adjective [ Prefix hypo- + sulphurous .] (Chemistry) Pertaining to, or containing, sulphur, all, or a part, in a low state of oxidation.

Hyposulphurous acid . (a) Thiosulphuric acid. [ Obsolete] (b) An acid, H 2 SO 2 , obtained by the reduction of sulphurous acid. It is not obtained in the free state, but in an orange-yellow water solution, which is a strong reducing and bleaching agent. Called also hydrosulphurous acid .

Hypotarsus noun ; plural Hypotarsi . [ New Latin See Hypo- , and Tarsus .] (Anat.) A process on the posterior side of the tarsometatarsus of many birds; the calcaneal process. -- Hy`po*tar"sal adjective

Hypotenuse, Hypothenuse noun [ Latin hypotenusa , Greek ..., probably , subtending (sc. ...), from ... to stretch under, subtend; ... under + ... to stretch. See Subtend .] (Geom.) The side of a right-angled triangle that is opposite to the right angle.

Hypothec noun [ French hypothèque . See Hypotheca .] (Scot. Law) A landlord's right, independently of stipulation, over the stocking (cattle, implements, etc.), and crops of his tenant, as security for payment of rent.

Hypotheca noun [ Latin , from Greek ... a thing subject to some obligation, from ... to put under, put down, pledge. See Hypothesis .] (Rom. Law) An obligation by which property of a debtor was made over to his creditor in security of his debt.

» It differed from pledge in regard to possession of the property subject to the obligation; pledge requiring, simple hypotheca not requiring, possession of it by the creditor. The modern mortgage corresponds very closely with it. Kent.

Hypothecate transitive verb [ imperfect & past participle Hypothecated ; present participle & verbal noun Hypothecating .] [ Late Latin hypothecatus , past participle of hypothecare to pledge, from Latin hypotheca pledge, security. See Hypotheca .] (Law) To subject, as property, to liability for a debt or engagement without delivery of possession or transfer of title; to pledge without delivery of possession; to mortgage, as ships, or other personal property; to make a contract by bottomry. See Hypothecation , Bottomry .

He had found the treasury empty and the pay of the navy in arrear. He had no power to hypothecate any part of the public revenue. Those who lent him money lent it on no security but his bare word.

Hypothecation noun [ Late Latin hypothecatio .]
1. (Civ. Law) The act or contract by which property is hypothecated; a right which a creditor has in or to the property of his debtor, in virtue of which he may cause it to be sold and the price appropriated in payment of his debt. This is a right in the thing, or jus in re . Pothier. B. R. Curtis.

There are but few cases, if any, in our law, where an hypothecation , in the strict sense of the Roman law, exists; that is a pledge without possession by the pledgee.

» In the modern civil law, this contract has no application to movable property, not even to ships, to which and their cargoes it is most frequently applied in England and America. See Hypothecate . B. R. Curtis. Domat.

2. (Law of Shipping) A contract whereby, in consideration of money advanced for the necessities of the ship, the vessel, freight, or cargo is made liable for its repayment, provided the ship arrives in safety. It is usually effected by a bottomry bond. See Bottomry .

» This term is often applied to mortgages of ships.

Hypothecator noun (Law) One who hypothecates or pledges anything as security for the repayment of money borrowed.

Hypothenal, Hypothenar adjective [ Prefix hypo- + thenar .] (Anat.) Of or pertaining to the prominent part of the palm of the hand above the base of the little finger, or a corresponding part in the forefoot of an animal; as, the hypothenar eminence.

Hypothenar noun (Anat.) The hypothenar eminence.

Hypothenusal adjective Of or pertaining to hypothenuse. [ R.]

Hypothenuse noun Same as Hypotenuse .

Hypothesis noun ; plural Hypotheses . [ New Latin , from Greek ... foundation, supposition, from ... to place under, ... under + ... to put. See Hypo- , Thesis .]
1. A supposition; a proposition or principle which is supposed or taken for granted, in order to draw a conclusion or inference for proof of the point in question; something not proved, but assumed for the purpose of argument, or to account for a fact or an occurrence; as, the hypothesis that head winds detain an overdue steamer.

An hypothesis being a mere supposition, there are no other limits to hypotheses than those of the human imagination.
J. S. Mill.

2. (Natural Science) A tentative theory or supposition provisionally adopted to explain certain facts, and to guide in the investigation of others; hence, frequently called a working hypothesis .

Syn. -- Supposition; assumption. See Theory .

Nebular hypothesis . See under Nebular .

Hypothetic, Hypothetical adjective [ Latin hypotheticus , Greek ...: confer French hypothétique .] Characterized by, or of the nature of, an hypothesis; conditional; assumed without proof, for the purpose of reasoning and deducing proof, or of accounting for some fact or phenomenon.

Causes hypothetical at least, if not real, for the various phenomena of the existence of which our experience informs us.
Sir W. Hamilton.

Hypothetical baptism (Ch. of Eng.) , baptism administered to persons in respect to whom it is doubtful whether they have or have not been baptized before. Hook.

-- Hy`po*thet"ic*al*ly , adverb South.

Hypothetist noun One who proposes or supports an hypothesis. [ R.]

Hypotrachelium noun [ Latin , from Greek ...; ... under + ... neck.] (Architecture) Same as Gorgerin .

Hypotricha noun plural [ New Latin , from Greek "ypo` beneath + ..., ..., a hair.] (Zoology) A division of ciliated Infusoria in which the cilia cover only the under side of the body.

Hypotrochoid noun [ Prefix hypo- + trochoid .] (Geom.) A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See Hypocycloid , Epicycloid , and Trochoid .

Hypotyposis noun [ New Latin , from Greek ..., from ... to sketch out; ... under + ... to impress.] (Rhet.) A vivid, picturesque description of scenes or events.

Hypoxanthin noun [ Prefix hypo- + xanthin .] (Physiol. Chem.) A crystalline, nitrogenous substance, closely related to xanthin and uric acid, widely distributed through the animal body, but especially in muscle tissue; -- called also sarcin , sarkin .

Hypozoic adjective [ Prefix hypo- + Greek ... an animal.] (Geol.) Anterior in age to the lowest rocks which contain organic remains. Lyell.

Hyppish adjective [ From Hyp .] Affected with hypochondria; hypped. [ Written also hyppish .]

Hyppogriff noun See Hyppogriff .

Hypsiloid adjective [ From Υ, the Greek letter called "upsilon" + -oid .] (Anat.) Resembling the Greek letter Υ in form; hyoid.

Hypsometer noun [ Greek ... height + -meter .] (Physics) An instrument for measuring heights by observation of barometric pressure; esp., one for determining heights by ascertaining the boiling point of water. It consists of a vessel for water, with a lamp for heating it, and an inclosed thermometer for showing the temperature of ebullition.

Hypsometric, Hypsometrical adjective Of or pertaining to hypsometry.

Hypsometry noun That branch of the science of geodesy which has to do with the measurement of heights, either absolutely with reference to the sea level, or relatively.

Hypural adjective [ Prefix hypo- + Greek ... tail.] (Anat.) Under the tail; -- applied to the bones which support the caudal fin rays in most fishes.

Hyracoid adjective (Zoology) Of or pertaining to the Hyracoidea. -- noun One of the Hyracoidea.