Orthoclase (n.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.
Orthoclastic (a.) Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.
Orthodiagonal (n.) The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.
Orthodome (n.) See the Note under Dome, 4.
Orthodox (a.) 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.
Orthodox (a.) 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.
Orthodox (a.) Approved; conventional.
Orthodoxal (a.) Pertaining to, or evincing, orthodoxy; orthodox.
Orthodoxality (n.) Orthodoxness.
Orthodoxally (adv.) Orthodoxly.
Orthodoxastical (a.) Orthodox.
Orthodoxical (a.) Pertaining to, or evincing, orthodoxy; orthodox.
Orthodoxly (adv.) In an orthodox manner; with soundness of faith.
Orthodoxness (n.) The quality or state of being orthodox; orthodoxy.
Orthodoxy (n.) 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.
Orthodoxy (n.) Consonance to genuine Scriptural doctrines; -- said of moral doctrines and beliefs; as, the orthodoxy of a creed.
Orthodoxy (n.) By extension, said of any correct doctrine or belief.
Orthodromic (a.) Of or pertaining to orthodromy.
Orthodromics (n.) 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 (n.) The act or art of sailing on a great circle.
Orthoepic (a.) Alt. of Orthoepical
Orthoepical (a.) Of or pertaining to orthoepy, or correct pronunciation.
Orthoepist (n.) One who is skilled in orthoepy.
Orthoepy (n.) The art of uttering words correctly; a correct pronunciation of words; also, mode of pronunciation.
Orthogamy (n.) Direct fertilization in plants, as when the pollen fertilizing the ovules comes from the stamens of the same blossom; -- opposed to heterogamy.
Orthognathic (a.) Orthognathous.
Orthognathism (n.) The quality or state of being orthognathous.
Orthognathous (a.) 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 (n.) A rectangular figure.
Orthogonal (a.) Right-angled; rectangular; as, an orthogonal intersection of one curve with another.
Orthogonally (adv.) Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally.
Orthographer (n.) One versed in orthography; one who spells words correctly.
Orthographic (a.) Alt. of Orthographical
Orthographical (a.) Of or pertaining to orthography, or right spelling; also, correct in spelling; as, orthographical rules; the letter was orthographic.
Orthographical (a.) Of or pertaining to right lines or angles.
Orthographically (adv.) In an orthographical manner
Orthographically (adv.) according to the rules of proper spelling
Orthographically (adv.) according to orthographic projection.
Orthographist (n.) One who spells words correctly; an orthographer.
Orthographize (v. t.) To spell correctly or according to usage; to correct in regard to spelling.
Orthography (n.) 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.
Orthography (n.) The part of grammar which treats of the letters, and of the art of spelling words correctly.
Orthography (n.) A drawing in correct projection, especially an elevation or a vertical section.
Orthology (n.) The right description of things.
Orthometric (a.) Having the axes at right angles to one another; -- said of crystals or crystalline forms.
Orthometry (n.) The art or practice of constructing verses correctly; the laws of correct versification.
Orthomorphic (a.) Having the right form.
Orthopedic (a.) Alt. of Orthopedical
Orthopedical (a.) 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 (n.) One who prevents, cures, or remedies deformities, esp. in children.
Orthopedy (n.) The art or practice of curing the deformities of children, or, by extension, any deformities of the human body.
Orthophony (n.) The art of correct articulation; voice training.
Orthopinacoid (n.) A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.
Orthopn/a (n.) Alt. of Orthopny
Orthopny (n.) Specifically, a morbid condition in which respiration can be performed only in an erect posture; by extension, any difficulty of breathing.
Orthopoda (n. pl.) An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts.
Orthopraxy (n.) The treatment of deformities in the human body by mechanical appliances.
Orthoptera (n. pl.) An order of mandibulate insects including grasshoppers, locusts, cockroaches, etc. See Illust. under Insect.
Orthopteran (n.) One of the Orthoptera.
Orthopterous (a.) Of or pertaining to the Orthoptera.
Orthorhombic (a.) Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.
Orthoscope (n.) An instrument designed to show the condition of the superficial portions of the eye.
Orthoscopic (a.) Giving an image in correct or normal proportions; giving a flat field of view; as, an orthoscopic eyepiece.
Orthosilicic (a.) Designating the form of silicic acid having the normal or highest number of hydroxyl groups.
Orthospermous (a.) Having the seeds straight, as in the fruits of some umbelliferous plants; -- opposed to coelospermous.
Orthostade (n.) A chiton, or loose, ungirded tunic, falling in straight folds.
Orthostichies (pl. ) of Orthostichy
Orthostichy (n.) A longitudinal rank, or row, of leaves along a stem.
Orthotomic (a.) Cutting at right angles.
Orthotomous (a.) Having two cleavages at right angles with one another.
Orthotomy (n.) The property of cutting at right angles.
Orthotone (a.) Retaining the accent; not enclitic; -- said of certain indefinite pronouns and adverbs when used interrogatively, which, when not so used, are ordinarilly enclitic.
Orthotropal (a.) Alt. of Orthotropous
Orthotropous (a.) Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.
Orthotropic (a.) Having the longer axis vertical; -- said of erect stems.
Orthoxylene (n.) That variety of xylene in which the two methyl groups are in the ortho position; a colorless, liquid, combustible hydrocarbon resembling benzene.
Ortive (a.) Of or relating to the time or act of rising; eastern; as, the ortive amplitude of a planet.
Ortolan (n.) A European singing bird (Emberiza hortulana), about the size of the lark, with black wings. It is esteemed delicious food when fattened. Called also bunting.
Ortolan (n.) In England, the wheatear (Saxicola oenanthe).
Ortolan (n.) In America, the sora, or Carolina rail (Porzana Carolina). See Sora.
Ortygan (n.) One of several species of East Indian birds of the genera Ortygis and Hemipodius. They resemble quails, but lack the hind toe. See Turnix.
Orval (n.) A kind of sage (Salvia Horminum).
Orvet (n.) The blindworm.
Orvietan (n.) A kind of antidote for poisons; a counter poison formerly in vogue.
-ory () An adjective suffix meaning of or pertaining to, serving for; as in auditory, pertaining to or serving for hearing; prohibitory, amendatory, etc.
-ory () A noun suffix denoting that which pertains to, or serves for; as in ambulatory, that which serves for walking; consistory, factory, etc.
Oryal (n.) Alt. of Oryall
Oryall (n.) See Oriel.
Oryctere (n.) The aard-vark.
Orycterope (n.) Same as Oryctere.
Oryctognosy (n.) Mineralogy.
Oryctography (n.) Description of fossils.
Oryctological (a.) Of or pertaining to oryctology.
Oryctologist (n.) One versed in oryctology.
Oryctology (n.) An old name for paleontology.
Oryctology (n.) An old name for mineralogy and geology.
Oryx (n.) A genus of African antelopes which includes the gemsbok, the leucoryx, the bisa antelope (O. beisa), and the beatrix antelope (O. beatrix) of Arabia.
Oryza (n.) A genus of grasses including the rice plant; rice.
Ossa (pl. ) of Os
Os (n.) A bone.