Webster's Dictionary, 1913

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Hyperplastic adjective
1. Of or pertaining to hyperplasia.

2. (Biol.) Tending to excess of formative action.

Hyperpnœa noun [ New Latin , from Greek "ype`r over + ..., ..., breath.] (Physiol.) Abnormal breathing, due to slightly deficient arterialization of the blood; -- in distinction from eupnœa . See Eupnœa , and Dispnœa .

Hyperpyrexia noun [ New Latin See Hyper- , and Pyrexia .] (Medicine) A condition of excessive fever; an elevation of temperature in a disease, in excess of the limit usually observed in that disease.

Hypersecretion noun (Medicine) Morbid or excessive secretion, as in catarrh.

Hypersensibility noun See Hyperæsthesia .

Hyperspace (-spās) noun [ Prefix hyper- + space .] (Geom.) An imagined space having more than three dimensions.

Hypersthene (hī"pẽr*sthēn) noun [ Greek "ype`r over + sqe`nos strength: confer French hyperstène .] (Min.) An orthorhombic mineral of the pyroxene group, of a grayish or greenish black color, often with a peculiar bronzelike luster (schiller) on the cleavage surface.

Hypersthenic adjective (Min.) Composed of, or containing, hypersthene.

Hyperthetical adjective [ Greek ...; "ype`r over + tiqe`nai to place.] Exaggerated; excessive; hyperbolical. [ Obsolete]

Hyperthetical or superlative . . . expression.
Chapman.

Hyperthyrion noun [ New Latin , from Greek ...; "ype`r over + ... door.] (Architecture) That part of the architrave which is over a door or window.

Hypertrophic, Hypertrophical adjective [ Confer French hypertrophique .] (Med. & Biol.) Of or pertaining to hypertrophy; affected with, or tending to, hypertrophy.

Hypertrophied adjective (Med. & Biol.) Excessively developed; characterized by hypertrophy.

Hypertrophy noun [ Greek "ype`r over, beyond + ... nourishment, from ... to nourish: confer French hypertrophie .] (Med. & Biol.) A condition of overgrowth or excessive development of an organ or part; -- the opposite of atrophy .

Hyphen noun [ Latin , from Greek ..., from ... under one, into one, together, from ... under + ..., neut. of ... one. See Hypo- .] (Print.) A mark or short dash, thus [ -], placed at the end of a line which terminates with a syllable of a word, the remainder of which is carried to the next line; or between the parts of many a compound word; as in fine- leaved , clear-headed . It is also sometimes used to separate the syllables of words.

Hyphen transitive verb [ imperfect & past participle Hyphened ; present participle & verbal noun Hyphening .] To connect with, or separate by, a hyphen, as two words or the parts of a word.

Hyphenated adjective United by hyphens; hyphened; as, a hyphenated or hyphened word.

Hyphomycetes noun plural [ New Latin , from Greek ... a web + ..., ..., a mushroom.] (Botany) One of the great division of fungi, containing those species which have naked spores borne on free or only fasciculate threads. M. J. Berkley.

Hyphæ noun plural [ New Latin , from Greek "yfh` a web.] (Botany) The long, branching filaments of which the mycelium (and the greater part of the plant) of a fungus is formed. They are also found enveloping the gonidia of lichens, making up a large part of their structure.

Hypidiomorphic adjective [ Prefix hypo- + idiomorphic .] (Crystallog.) Partly idiomorphic; -- said of rock a portion only of whose constituents have a distinct crystalline form. -- Hy*pid`i*o*mor"phic*al*ly adverb

Hypinosis noun [ New Latin , from Greek ... under + ..., ... strength, fiber.] (Medicine) A diminution in the normal amount of fibrin present in the blood.

Hypnagogic adjective [ Greek ... sleep + ... a carrying away.] Leading to sleep; -- applied to the illusions of one who is half asleep.

Hypnobate noun [ French, from Greek ... sleep + ... to go.] A somnambulist. [ R.]

Hypnocyst noun [ Greek ... sleep + English cyst .] (Biol.) A cyst in which some unicellular organisms temporarily inclose themselves, from which they emerge unchanged, after a period of drought or deficiency of food. In some instances, a process of spore formation seems to occur within such cysts.

Hypnogenic adjective [ Greek ... sleep + root of ... to be born.] (Physiol.) Relating to the production of hypnotic sleep; as, the so-called hypnogenic pressure points, pressure upon which is said to cause an attack of hypnotic sleep. De Watteville.

Hypnologist noun One who is versed in hypnology.

Hypnology noun [ Greek ... sleep + -logy .] A treatise on sleep; the doctrine of sleep.

Hypnoscope noun [ Greek ... + - scope .] (Physiol.) An instrument for ascertaining the susceptibility of a person to hypnotic influences.

Hypnosis noun [ New Latin , from Greek ... sleep.] (Medicine) Supervention of sleep.

Hypnosis noun The condition of being hypnotized.

Hypnotic adjective [ Greek ... inclined to sleep, putting to sleep, from ... to lull to sleep, from ... sleep; akin to Latin somnus , and English somnolent : confer French hypnotique .]
1. Having the quality of producing sleep; tending to produce sleep; soporific.

2. Of or pertaining to hypnotism; in a state of hypnotism; liable to hypnotism; as, a hypnotic condition.

Hypnotic noun
1. Any agent that produces, or tends to produce, sleep; an opiate; a soporific; a narcotic.

2. A person who exhibits the phenomena of, or is subject to, hypnotism.

Hypnotism noun [ Greek ... sleep: confer French hypnotisme .] A form of sleep or somnambulism brought on by artificial means, in which there is an unusual suspension of some powers, and an unusual activity of others. It is induced by an action upon the nerves, through the medium of the senses, as in persons of very feeble organization, by gazing steadly at a very bright object held before the eyes, or by pressure upon certain points of the surface of the body.

Hypnotization noun The act or process of producing hypnotism.

Hypnotize transitive verb [ imperfect & past participle Hypnotized ; present participle & verbal noun Hypnotizing .] To induce hypnotism in; to place in a state of hypnotism.

Hypnotizer noun One who hypnotizes.

Hypnum noun [ New Latin , from Greek ... moss.] (Botany) The largest genus of true mosses; feather moss.

Hypo noun Hypochondria. [ Colloq.]

Hypo noun [ Abbrev. from hyposulphite .] (Photog.) Sodium hyposulphite, or thiosulphate, a solution of which is used as a bath to wash out the unchanged silver salts in a picture. [ Colloq.]

Hypo- [ Greek ... under, beneath; akin to Latin sub . See Sub- .]
1. A prefix signifying a less quantity , or a low state or degree , of that denoted by the word with which it is joined, or position under or beneath .

2. (Chemistry) A prefix denoting that the element to the name of which it is prefixed enters with a low valence , or in a low state of oxidization , usually the lowest , into the compounds indicated; as, hypo sulphurous acid.

Hypoarian adjective (Anat.) Of or pertaining to a hypoarion.

Hypoarion noun ; plural Hypoaria . [ New Latin , from Greek "ypo` beneath + ... a little egg.] (Anat.) An oval lobe beneath each of the optic lobes in many fishes; one of the inferior lobes. Owen.

Hypoblast noun [ Prefix hypo- + -blast .] (Biol.) The inner or lower layer of the blastoderm; -- called also endoderm , entoderm , and sometimes hypoderm . See Illust. of Blastoderm , Delamination , and Ectoderm .

Hypoblastic adjective (Biol.) Relating to, or connected with, the hypoblast; as, the hypoic sac.

Hypobole noun [ Greek ... a throwing under, a suggesting; ... under + ... to throw.] (Rhet.) A figure in which several things are mentioned that seem to make against the argument, or in favor of the opposite side, each of them being refuted in order.

Hypobranchial adjective [ Prefix hypo- + branchial .] (Anat.) Pertaining to the segment between the basibranchial and the ceratobranchial in a branchial arch. -- noun A hypobranchial bone or cartilage.

Hypocarp Hy`po*car"pi*um noun [ New Latin hypocarpium , from Greek "ypo` beneath + ... fruit.] (Botany) A fleshy enlargement of the receptacle, or for the stem, below the proper fruit, as in the cashew. See Illust. of Cashew .

Hypocarpogean adjective [ Prefix hypo- + Greek ... fruit + ... earth.] (Botany) Producing fruit below the ground.

Hypocaust noun [ Latin hypocaustum , Greek ...; ... under + ... to burn: confer French hypocauste .] (Anc. Arch.) A furnace, esp. one connected with a series of small chambers and flues of tiles or other masonry through which the heat of a fire was distributed to rooms above. This contrivance, first used in bath, was afterwards adopted in private houses.

Hypochlorite noun (Chemistry) A salt of hypochlorous acid; as, a calcium hypochloride .

Hypochlorous adjective [ Prefix hypo- + chlorous .] (Chemistry) Pertaining to, or derived from, chlorine having a valence lower than in chlorous compounds.

Hypochlorous acid (Chemistry) , an acid derived from chlorine, not known in a pure state, but forming various salts, called hypochlorites.