Orsellinic Or`sel·lin"ic adjective (Chemistry) Pertaining to, or designating, an organic acid obtained by a partial decomposition of orsellic acid as a white crystalline substance, and related to protocatechuic acid.

Ort Ort noun ; plural Orts . [ Akin to LG. ort , ortels , remnants of food, refuse, OFries. ort , OD. oorete , ooraete ; probably from the same prefix as in English or deal + a word akin to eat .] A morsel left at a meal; a fragment; refuse; -- commonly used in the plural. Milton.

Let him have time a beggar's orts to crave.

Shak.

Ortalidian Or`ta·lid"i·an noun (Zoology) Any one of numerous small two-winged flies of the family Ortalidæ . The larvæ of many of these flies live in fruit; those of others produce galls on various plants.

Orthid Or"thid noun (Zoology) A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidæ .

Orthis Or"this (ôr"thĭs) noun [ New Latin , from Greek 'orqo`s straight.] (Zoology) An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.

Orthite Or"thite noun [ Greek ... straight.] (Min.) A variety of allanite occurring in slender prismatic crystals.

Ortho- Or"tho- [ Greek ... straight; akin to Sanskrit ...rdhva upright, vrdh to grow, to cause to grow.]

1. A combining form signifying straight , right , upright , correct , regular ; as, ortho dromy, ortho diagonal, ortho dox, ortho graphic.

2. (Chemistry) A combining form (also used adjectively) , designating: (a) (Inorganic Chem.) The one of several acids of the same element (as the phosphoric acids), which actually occurs with the greatest number of hydroxyl groups ; as, ortho phosphoric acid. Confer Normal . (b) (Organic Chem.) Connection with , or affinity to , one variety of isomerism, characteristic of the benzene compounds; -- contrasted with meta- or para- ; as, the ortho position; hence, designating any substance showing such isomerism; as, an ortho compound.

» In the graphic representation of the benzene nucleus (see Benzene nucleus , under Benzene ), provisionally adopted, any substance exhibiting double substitution in adjacent and contiguous carbon atoms, as 1 & 2, 3 & 4, 4 & 5, etc., is designated by ortho- ; as, ortho xylene; any substance exhibiting substitution of two carbon atoms with one intervening, as 1 & 3, 2 & 4, 3 & 5, 4 & 6, etc., by meta- ; as, resorcin or meta xylene; any substance exhibiting substitution in opposite parts, as 1 & 4, 2 & 5, 3 & 6, by para- ; as, hydroquinone or para xylene.

Orthocarbonic Or`tho·car·bon"ic adjective [ Ortho- + carbonic .] (Chemistry) Designating a complex ether, C.(OC ₂ H ₅ ) ₄ , which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH) ₄ .

Orthocenter Or`tho·cen"ter noun [ Ortho- + center .] (Geom.) That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.

Orthoceras Or·thoc"e·ras noun [ New Latin , from Greek 'orqo`s straight + ... a horn.] (Paleon.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.

Orthoceratite Or`tho·cer"a·tite noun [ Ortho- + Greek ..., ..., a horn.] (Zoology) An orthoceras; also, any fossil shell allied to Orthoceras.

Orthoclase Or"tho·clase noun [ Ortho- + Greek ... to break.] (Min.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar .

Orthoclastic Or`tho·clas"tic adjective (Crystallog.) Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.

Orthodiagonal Or`tho·di·ag"o·nal noun [ Ortho- + diagonal .] (Crystallog.) The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

Orthodome Or"tho·dome noun [ Ortho- + dome .] (Crystallog.) See the Note under Dome , 4.

Orthodox Or"tho·dox adjective [ Latin orthodoxus , Greek 'orqo`doxos ; 'orqo`s right, true + do`xa opinion, dokei^n to think, seem; confer French orthodoxe . See Ortho- , Dogma .] 1. Sound in opinion or doctrine, especially in religious doctrine; hence, holding the Christian faith; believing the doctrines taught in the Scriptures; -- opposed to heretical and heterodox ; as, an orthodox Christian.

2. According or congruous with the doctrines of Scripture, the creed of a church, the decree of a council, or the like; as, an orthodox opinion, book, etc.

3. Approved; conventional.

He saluted me on both cheeks in the orthodox manner.

H. R. Haweis.

» The term orthodox differs in its use among the various Christian communions. The Greek Church styles itself the "Holy Orthodox Apostolic Church," regarding all other bodies of Christians as more or less heterodox. The Roman Catholic Church regards the Protestant churches as heterodox in many points. In the United States the term orthodox is frequently used with reference to divergent views on the doctrine of the Trinity. Thus it has been common to speak of the Trinitarian Congregational churches in distinction from the Unitarian, as Orthodox . The name is also applied to the conservative, in distinction from the "liberal", or Hicksite, body in the Society of Friends. Schaff-Herzog Encyc.

Orthodoxal Or"tho·dox`al adjective Pertaining to, or evincing, orthodoxy; orthodox. [ R.] Milton.

Orthodoxality Or`tho·dox·al"i·ty noun Orthodoxness. [ R.]

Orthodoxally Or"tho·dox`al·ly adverb Orthodoxly. [ R.] Milton

Orthodoxastical Or`tho·dox·as"tic·al adjective Orthodox. [ Obsolete]

Orthodoxical Or`tho·dox"ic·al adjective Pertaining to, or evincing, orthodoxy; orthodox.

Orthodoxly Or"tho·dox`ly adverb In an orthodox manner; with soundness of faith. Sir W. Hamilton.

Orthodoxness Or"tho·dox`ness noun The quality or state of being orthodox; orthodoxy. Waterland.

Orthodoxy Or"tho·dox`y noun [ Greek ...: confer French orthodoxie . See Orthodox .] 1. Soundness of faith; a belief in the doctrines taught in the Scriptures, or in some established standard of faith; -- opposed to heterodoxy or to heresy .

Basil himself bears full and clear testimony to Gregory's orthodoxy .

Waterland.

2. Consonance to genuine Scriptural doctrines; -- said of moral doctrines and beliefs; as, the orthodoxy of a creed.

3. By extension, said of any correct doctrine or belief.

Orthodromic Or`tho·drom"ic adjective [ Ortho- + Greek ... to run.] Of or pertaining to orthodromy.

Orthodromics Or`tho·drom"ics noun The art of sailing in a direct course, or on the arc of a great circle, which is the shortest distance between any two points on the surface of the globe; great-circle sailing; orthodromy.

Orthodromy Or"tho·drom`y noun [ Confer French orthodromie .] The act or art of sailing on a great circle.

Orthoëpic, Orthoëpical Or`tho·ëp"ic, Or`tho·ëp"ic·al adjective Of or pertaining to orthoëpy, or correct pronunciation. -- Or`tho*ëp"ic*al*ly , adverb

Orthoëpist Or"tho·ë·pist noun One who is skilled in orthoëpy.

Orthoëpy Or"tho·ë·py noun [ Greek ...; 'orqo`s right + ... a word: confer French orthoépie . See Ortho- , and Epic .] The art of uttering words correctly; a correct pronunciation of words; also, mode of pronunciation.

Orthogamy Or·thog"a·my noun [ Ortho- + Greek ... marriage.] (Botany) Direct fertilization in plants, as when the pollen fertilizing the ovules comes from the stamens of the same blossom; -- opposed to heterogamy .

Orthognathic Or`thog·nath"ic adjective Orthognathous.

Orthognathism Or·thog"na·thism noun (Anat.) The quality or state of being orthognathous. Huxley.

Orthognathous Or·thog"na·thous adjective [ Ortho- + Greek ... the jaw.] (Anat.) Having the front of the head, or the skull, nearly perpendicular, not retreating backwards above the jaws; -- opposed to prognathous . See Gnathic index , under Gnathic .

Orthogon Or"tho·gon noun [ Ortho- + Greek ... angle: confer French orthogone , adjective ] (Geom.) A rectangular figure.

Orthogonal Or·thog"o·nal adjective [ Confer French orthogonal .] Right-angled; rectangular; as, an orthogonal intersection of one curve with another.

Orthogonal projection . See under Orthographic .

Orthogonally Or·thog"o·nal·ly adverb Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally .

Orthograph Or"tho·graph noun [ Ortho- + -graph .] (Architecture) An orthographic projection, sometimes partly in section, esp. of a building.

Orthographer Or·thog"ra·pher noun One versed in orthography; one who spells words correctly.

Orthographic, Orthographical Or`tho·graph"ic, Or`tho·graph"ic·al adjective [ Confer French orthographique , Latin orthographus , Greek ....]

1. Of or pertaining to orthography, or right spelling; also, correct in spelling; as, orthographical rules; the letter was orthographic .

2. (Geom.) Of or pertaining to right lines or angles.

Orthographic or Orthogonal , projection , that projection which is made by drawing lines, from every point to be projected, perpendicular to the plane of projection. Such a projection of the sphere represents its circles as seen in perspective by an eye supposed to be placed at an infinite distance, the plane of projection passing through the center of the sphere perpendicularly to the line of sight.

Orthographically Or`tho·graph"ic·al·ly adverb In an orthographical manner : (a) according to the rules of proper spelling ; (b) according to orthographic projection.

Orthographist Or·thog"ra·phist noun One who spells words correctly; an orthographer.

Orthographize Or·thog"ra·phize transitive verb To spell correctly or according to usage; to correct in regard to spelling.

In the coalesced into ith , which modern reaction has orthographized to i' th' .

Earle.

Orthography Or·thog"ra·phy noun [ Middle English ortographie , Old French orthographie , Latin orthographia , Greek ..., from ... writing correctly; 'orqo`s right + gra`fein to write. See Ortho- , and Graphic .]

1. The art or practice of writing words with the proper letters, according to standard usage; conventionally correct spelling; also, mode of spelling; as, his orthography is vicious.

When spelling no longer follows the pronunciation, but is hardened into orthography .

Earle.

2. The part of grammar which treats of the letters, and of the art of spelling words correctly.

3. A drawing in correct projection, especially an elevation or a vertical section.

Orthology Or·thol"o·gy noun [ Greek ...; 'orqo`s right + ... speech, description: confer French orthologie .] The right description of things. [ R.] Fotherby.

Orthometric Or`tho·met"ric adjective [ See Orthometry .] (Crystallog.) Having the axes at right angles to one another; -- said of crystals or crystalline forms.

Orthometry Or·thom"e·try noun [ Ortho- + -metry .] The art or practice of constructing verses correctly; the laws of correct versification.

Orthomorphic Or`tho·mor"phic adjective [ Ortho- + morphic .] (Geom.) Having the right form.

Orthomorphic projection , a projection in which the angles in the figure to be projected are equal to the corresponding angles in the projected figure.

Orthopedic, Orthopedical Or`tho·ped"ic, Or`tho·ped"ic·al adjective (Medicine) Pertaining to, or employed in, orthopedy; relating to the prevention or cure of deformities of children, or, in general, of the human body at any age; as, orthopedic surgery; an orthopedic hospital.

Orthopedist Or·thop"e·dist noun (Medicine) One who prevents, cures, or remedies deformities, esp. in children.

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