Orthopedy Or·thop"e·dy noun [
Ortho- + Greek ..., ..., a child.]
(Medicine) The art or practice of curing the deformities of children, or, by extension, any deformities of the human body.
Orthophony Or·thoph"o·ny noun [
Ortho- + Greek ... voice.]
The art of correct articulation; voice training.
Orthopinacoid Or`tho·pin"a·coid noun [
Ortho- +
pinacoid .]
(Crystallog.) A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes.
Orthopnœa, Orthopny Or`thop·nœ"a, Or·thop"ny noun [ Latin
orthopnoea , Greek ...;
'orqo`s straight, right +
pnei^n to breathe: confer French
orthopnée .]
(Medicine) Specifically, a morbid condition in which respiration can be performed only in an erect posture; by extension, any difficulty of breathing.
Orthopoda Or·thop"o·da noun plural [ New Latin See
Ortho- , and
-poda .]
(Zoology) 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 Or"tho·prax`y noun [ Greek
'orqo`s straight + ... a doing.]
(Medicine) The treatment of deformities in the human body by mechanical appliances.
Orthoptera Or·thop"te·ra noun plural [ New Latin , from Greek
'orqo`s straight + ... feather, wing.]
(Zoology) An order of mandibulate insects including grasshoppers, locusts, cockroaches, etc. See Illust. under Insect . » The anterior wings are usually thickened and protect the posterior wings, which are larger and fold longitudinally like a fan. The Orthoptera undergo no metamorphosis.
Orthopteran Or·thop"ter·an noun (Zoology) One of the Orthoptera.
Orthopterous Or·thop"ter·ous adjective (Zoology) Of or pertaining to the Orthoptera.
Orthorhombic Or`tho·rhom"bic adjective [
Ortho- +
rhombic .]
(Crystallog.) Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization .
Orthoscope Or"tho·scope noun [
Ortho- +
-scope .]
(Physyol.) An instrument designed to show the condition of the superficial portions of the eye.
Orthoscopic Or`tho·scop"ic adjective (Opt.) Giving an image in correct or normal proportions; giving a flat field of view; as, an orthoscopic eyepiece.
Orthosilicic Or`tho·si·lic"ic adjective [
Ortho- +
silicic .]
(Chemistry) Designating the form of silicic acid having the normal or highest number of hydroxyl groups.
Orthospermous Or`tho·sper"mous adjective [
Ortho- + Greek ... seed.]
(Botany) Having the seeds straight, as in the fruits of some umbelliferous plants; -- opposed to cœlospermous . Darwin.
Orthostade Or"tho·stade noun [ Greek ...;
'orqo`s straight + ... to place.]
(Anc. Costume) A chiton, or loose, ungirded tunic, falling in straight folds.
Orthostichy Or·thos"ti·chy noun ;
plural Orthostichies . [
Ortho- + Greek ... row.]
(Botany) A longitudinal rank, or row, of leaves along a stem.
Orthotomic Or`tho·tom"ic adjective [
Ortho- + Greek ... to cleave.]
(Geom.) Cutting at right angles. Orthotomic circle (Geom.) ,
that circle which cuts three given circles at right angles.
Orthotomous Or·thot"o·mous adjective (Crystallog.) Having two cleavages at right angles with one another.
Orthotomy Or·thot"o·my noun (Geom.) The property of cutting at right angles.
Orthotone Or"tho·tone adjective [
Ortho- + Greek ... tone, accent.]
(Gr. Gram.) Retaining the accent; not enclitic; -- said of certain indefinite pronouns and adverbs when used interrogatively, which, when not so used, are ordinarilly enclitic.
Orthotropal, Orthotropous Or·thot"ro·pal, Or·thot"ro·pous adjective [
Ortho- + Greek ... to turn: confer French
orthotrope .]
(Botany) Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous. » This word has also been used (but improperly) to describe any embryo whose radicle points towards, or is next to, the hilum.
Orthotropic Or`tho·trop"ic adjective [ See
Orthotropal .]
(Botany) Having the longer axis vertical; -- said of erect stems. Encyc. Brit.
Orthoxylene Or`tho·xy"lene noun [
Ortho- +
xylene .]
(Chemistry) That variety of xylene in which the two methyl groups are in the ortho position; a colorless, liquid, combustible hydrocarbon resembling benzene.
Ortive Or"tive adjective [ Latin
ortivus , from
oriri ,
ortus , to rise: confer French
ortive .]
Of or relating to the time or act of rising; eastern; as, the ortive amplitude of a planet.
Ortolan Or"to·lan noun [ French, from Italian
ortolano ortolan, gardener, from Latin
hortulanus gardener, from
hortulus , dim. of
hortus garden. So called because it frequents the hedges of gardens. See
Yard an inclosure, and confer
Hortulan .]
(Zoology) (a) 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 . (b) In England, the wheatear ( Saxicola œnanthe ). (c) In America, the sora, or Carolina rail ( Porzana Carolina ). See Sora .
Ortygan Or"ty·gan noun [ Greek ..., ..., a quail.]
(Zoology) 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 Or"val noun [ French
orvale .]
(Botany) A kind of sage ( Salvia Horminum ).
Orvet Or`vet" noun [ French]
(Zoology) The blindworm.
Orvietan Or`vi·e"tan noun [ French
orviétan : confer Italian
orvietano . So called because invented at
Orvieto , in Italy.]
A kind of antidote for poisons; a counter poison formerly in vogue. [ Obsolete]
Oryal, Oryall O"ry·al, O"ry·all noun See Oriel .
Oryctere Or"yc·tere noun [ Greek ... digger: confer French
oryctère .]
(Zoology) The aard- vark.
Orycterope O·ryc"ter·ope noun [ Greek ... digger + ... foot.]
(Zoology) Same as Oryctere .
Oryctognosy Or`yc·tog"no·sy noun [ Greek ... dug (... to dig) + ... knowledge.]
Mineralogy. [ Obsolete] --
Or`yc*tog*nos"tic adjective --
Or`yc*tog*nos"tic*al adjective [ Obsolete] --
Or`yc*tog*nos"tic*al*ly adverb [ Obsolete]
Oryctography Or`yc·tog"ra·phy noun [ Greek ... dug +
-graphy .]
Description of fossils. [ Obsolete]
Oryctological Or`yc·to·log"ic·al adjective [ Confer French
oryctologique .]
Of or pertaining to oryctology. [ Obsolete]
Oryctologist Or`yc·tol"o·gist noun One versed in oryctology. [ Obsolete]
Oryctology Or`yc·tol"o·gy noun [ Greek ... dug +
-logy : confer French
oryctologie .]
1. An old name for paleontology. 2. An old name for mineralogy and geology.
Oryx O"ryx noun [ New Latin , from Greek ... a kind of gazelle or antelope.]
(Zoology) 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 O·ry"za noun [ Latin , rice, Greek ... See
Rice .]
(Botany) A genus of grasses including the rice plant; rice.
Os Os noun ;
plural Ossa . [ Latin ]
A bone.
Os Os noun ;
plural Ora . [ Latin ]
A mouth; an opening; an entrance.
Os Os noun ;
plural Osar . [ Swedish
ås ridge, chain of hills, plural
åsar .]
(Geol.) One of the ridges of sand or gravel found in Sweden, etc., supposed by some to be of marine origin, but probably formed by subglacial waters. The osar are similar to the kames of Scotland and the eschars of Ireland. See Eschar .
Osage orange O"sage or"ange (Botany) An ornamental tree of the genus Maclura ( M. aurantiaca ), closely allied to the mulberry ( Morus ); also, its fruit. The tree was first found in the country of the Osage Indians, and bears a hard and inedible fruit of an orangelike appearance. See Bois d'arc .
Osages O·sa"ges noun plural ; sing.
Osage (Ethnol.) A tribe of southern Sioux Indians, now living in the Indian Territory.
Osanne O·san"ne noun Hosanna. [ Obsolete]
Chaucer.
Osar O"sar noun plural (Geol.) See 3d Os .
Oscan Os"can adjective Of or pertaining to the Osci, a primitive people of Campania, a province of ancient Italy. --
noun The language of the Osci.
Oscillancy Os"cil·lan·cy noun The state of oscillating; a seesaw kind of motion. [ R.]
Oscillaria Os`cil·la"ri·a noun [ New Latin , from Latin
oscillare to swing.]
(Botany) A genus of dark green, or purplish black, filamentous, fresh-water algæ, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria .
Oscillate Os"cil·late intransitive verb [
imperfect & past participle Oscillated ;
present participle & verbal noun Oscillating .] [ Latin
oscillare to swing, from
oscillum a swing, a little mask or puppet made to be hung from trees and swing in the wind, probably orig., a little mouth, a dim. from
os mouth. See
Oral , and confer
Osculate .]
1. To move backward and forward; to vibrate like a pendulum; to swing; to sway. 2. To vary or fluctuate between fixed limits; to act or move in a fickle or fluctuating manner; to change repeatedly, back and forth. The amount of superior families oscillates rather than changes, that is, it fluctuates within fixed limits.
Dc Quincey.
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