

PREBASILAR 



1173 



PREDEXTARY 



Prebasilar (pre-ba' ' zil-ar) [ prce, before ; basis, base]. 

 Situated, or occurring, in front of any basilar structure, 

 icially, in front of the basilar process of the occipi- 

 tal bone. 



Prebrachial (pre-bra' -ke-al) [pr<z, before ; brackium, 

 upper arm], (a) Located on the anterior aspect of the 

 brachium or upper arm, e. g., the group of prebrachial 

 muscles : biceps, coraco-brachialis, and brachialis 

 amicus, (b) A vein in the wings of certain insects. 



Prebrachium (pre-bra' -ke-um) [pre?, before; bra- 

 chium, arm]. The anterior brachium of the brain 

 seen on the lateral slope of the mesencephal. The 

 fibers run obliquely dorsoventrad. In biology, the 

 antebrachial membrane or propatagium. The wing- 

 membrane of bats, above the arm or forearm. 



Prebranchial (pre-brang' -ke-al) [prce, before; bran- 

 chicz, gills]. In biology, located in front of the gills. 



Prebronchial (pre-brong* -ke-al)\_prce, before ; 3p6yxoc, 

 bronchus]. Situated in front of the bronchi. 



Prebuccal (pre-buk*-al) \_pnr, before: bucca, cheek]. 

 In biology, placed in front of the mouth ; preoral ; 

 prostomial. 



Precancerous (pre-kan' -ser-us) [prir, before; cancer, 

 carcinoma]. Occurring before the development of a 

 carcinoma. 



Precardiac (pre-kar* -de-ak) [pro:, before ; KapAia, 

 heart]. Cephalad of the heart. 



Precartilaginous (pre-kar-til-aj* -in-us) \_prce-, before ; 

 . cartilage]. Prior to the formation of carti- 

 lage, as in a certain stage of an embryo. 



Precaudal (pre-kaw' -Jul) \_pnr, before ; cauda, tail]. 

 Situated in front of the tail or tail-vertebrae. 



Precava [pre-ka'-vah) \_prce, before; cazms, hollow]. 

 The anterior, or superior vena cava ; the vena cava 

 descendens. 



Precaval i pre-ka'-val) [pm, before; cazms, hollow]. 

 Pertaining to the precava. 



Precentral ( pre-sen'-tral) [pm, before; centrum, 

 center]. Situated in front of the central fissure. P. 

 Convolution. See Convolutions, Table of. P. Fis- 

 sure. See Fissures, Table of. P. Sulcus. Synonym 

 of P. Fissure. 



Precerebellar ( pre-ser-e-bel'-ar ) [pr&, before ; cere- 

 bellum, cerebellum]. Situated before (above) the 

 cerebellum. 



Precerebral (pre-ser* -e-bral) [prce, before ; cerebrum, 

 cerebrum]. Situated, or occurring before (above), the 

 cerebrum . 



Prechordal ( pre-kor' -dal ) \_prce, before ; chorda, chord, 

 string]. Situated in front of the notochord. 



Precipitant {pre-sip' '-it-ant) [pra, before ; caput, head]. 

 Any reagent causing precipitation. 



Precipitate (pre-sip* -it-dt) [pro:, before ; caput, head]. 

 The solid substance thrown down from a solution of 

 a substance on the addition of a reagent which de- 

 prives it of its solubility. [Abbreviation: Ppt.] P., 

 Atmospheric, one formed on simple exposure to the 

 air. P., Red. See Hydrargyrum oxidum rubrum. 

 P., White. X.,! Hg 2 ) 3 Cl.„ formed by adding ammonium 

 hydrate to a solution of mercuric chlorid. Hydrargy- 

 rum ammoniatum. 



Precipitate ( pre-sip' -it-it) [pro", before ; caput, head]. 

 Headlong ; hasty. P. Labor. See Labor. 



Precipitation (pre-sip-it-a' -shun) [ pr<zcipitatio~\ . The 

 process of throwing down solids from the liquids 

 which hold them in solution. It is usually effected by 

 iiemic reaction. Precipitates are crystalline, amor- 

 urdy, ftocculent, granular, or gelatinous, ac- 

 cording to the form assumed. The agent causing 

 precipitation is the precipitant, the solid thrown down, 

 the precipitate. P., Fractional, the process employed 

 in separating a mixture of fatty acids by the addition 



of small portions of the acetate of a heavy metal. 

 The precipitate consists of a combination of the metal 

 with a large proportion of the less volatile acid and a 

 small proportion of the more volatile acid. In the 

 filtrate the proportions are reversed. The metal is sepa- 

 rated from the less volatile acid by dissolving the pre- 

 cipitate in hydrochloric acid. The process is repeated 

 until finally the filtrate contains practically only the 

 more volatile acid, and the precipitate only the less 

 volatile acid. P., Partial, a process of separating two 

 soluble salts by precipitation of a portion of each, and 

 subsequent decomposition of the precipitate. The 

 latter is redissolved and again precipitated. 



Preclitellian (pre-kli-tel*-e-an) [pro:, before; clitellum, 

 a pack-saddle]. In biology, applied to such earth- 

 worms as have the ducts of the testes opening in front 

 of the clitellum. 



Precloacal prc-klo* -a-kal) \_pra:, before; cloaca, a 

 sewer]. In biology, of or pertaining to, the front part 

 of the cloaca. 



Precocity ( pre-kos' '-it-e) [prce, before; coauere, to 

 ripen]. Early development or maturity. It is applied 

 especially to great development of the mental faculties 

 at an early age. 



Precommissure (pre-korn'-is-ilr) [pnr, before; com- 

 missura, commissure]. The anterior commissure of 

 the brain ; it is a marked thickening of the parietes, a 

 compact bundle of nerve-fibers extending laterad 

 and dividing a short distance from the meson into 

 two portions, a temporal and an olfactory. 



Precoracoid, Praecoracoid (pre-kor* -ak-oid) [pra, 

 before; K«paf, raven; eiSoc, like]. In biology: (a) 

 placed in front of the coracoid process of the scapula ; 

 (b) a specific part of the pectoral arch of certain 

 vertebrates. 



Precordia ( pre-kor* -de-ah) \_prce, before ; cor, the heart : 

 either sing., nom., fem. , or pi. of Precordiuni\. A 

 name applied to the diaphragm, the thoracic viscera, 

 or the epigastric region, but often more especially to 

 the area of the chest overlying the heart. 



Precordial ( pre-kor* -de-al) [prce, before; cor, heart]. 

 Situated, or occurring, in the region of the precordia. 



Precordialgia (pre-kor-de-al* -je-ah) [prir, before; cor, 

 heart; a/; or, pain]. Pain in the precordial region. 



Precordium (pre-kor* -de-um). Synonym of Precordia. 



Precorneal (pre-kor* -ne-al) [_prce, before; corneus, 

 horny]. Situated on the front of the cornea of the 

 eye. 



Precornu (pre-kor* -nu) [pra, before; cornu, a horn]. 

 The anterior cornu of the lateral ventricle of the 

 brain. 



Precribrum ( pre-krib' -runi) \_prce, before; cribrum, 

 sieve]. The anterior perforated space of the brain. 



Precuneal (pre-ku'-ne-al) \_prce, before ; cuneus, 

 wedge]. Situated in front of the cuneus ; specifically, 

 pertaining to the precuneus. 



Precuneus (pre-ku'-ne-us) [P>ce, before; cuneus, 

 wedge]. The quadrate lobule of the parietal lobe 

 situated cephalad of the cuneus of the occipital lobe. 



Precurrent ( pre-kur*-ent) [pr&, before; currere, to 

 run]. In biology, extending cephalad ; antrorse. 



Precursor ( pre-kur*-sor) [ pnr, before ; currere, to 

 run]. A forerunner; a premonitory sign. 



Precursory (pre-kur*-sor-e). Synonym of Premon- 

 itory. 



Predacean (pre-da'-se-an)[ pradax, given to preying]. 

 In biology, a carnivorous or predaceous animal. 



Predelineation (pre-de-lin-e-a*-shun). Synonym of 

 Preformation . 



Predentary ( pre-den* -ta-re) \_pra, before; dens, tooth]. 

 In biology, a portion of the jaw-bone of certain 

 reptiles. 





