CRE- 



64 



CRY- 



A ridge on a bone ; a fleshy longi- 

 tudinal ridge as in newts (zool.). 



cretaceous (kreta'shus) a. [L. creta, 

 chalk.] Appl. the entire period 

 between the Jurassic and Tertiary, 

 or the upper division of this period 

 (Pal.) 



cribellum (kribel'um) n. [L. cribrum, 

 a sieve.] A special spinning organ 

 found only in certain spiders (zool.). 



cribriform (krib'riform)a. [L.cribruin, 

 a sieve ; forma, shape.] Sieve-like 

 (bot., anat., zool.). 



cribriform cell, sieve cell (bot.). 



cribriform organ, the folded mem- 

 brane carrying papillae in the 

 interradial angles of certain star- 

 fishes (zool.). 



cribriform plate, the horizontal 

 portion of the ethmoid perforated 

 with many foramina for the exit of 

 the olfactory nerves (anat., zool.). 



cricoid (knk'oid) n. [Gk. krikos, a 

 ring ; eidos, form.] A ring-like 

 cartilage in the larynx, articulating 

 with the thyroid and the arytaenoid 

 cartilages (anat.). 



crissal (kris'al) a. [L. crissare, to 

 move the haunches.] Pert, the 

 crissum (zool.). 



crissum (krib'um) ;/. [L. crissare, to 

 move the haunches.] The circum- 

 cloacal region of a bird, or the 

 feathers thereon (zool.). 



crista (krls'ta) n. [L. crista, a crest.] 

 A crest or ridge ; the projection 

 from the ectoloph into the median 

 valley in lophodont molars (zool.). 



crochet (kroch'gt) n. [F. crochet, a 

 small hook.] The projection of 

 the protoloph in lophodont molars 

 (zool.). 



crop (krop) n. [M.E. croppe, top of a 

 plant] A sac-like dilatation of the 

 gullet of a bird ; a similar structure 

 in an insect or worm (zool.). 



cross (kros) n. [M.E. crois, a cross.] 

 An organism produced by the 

 mating of parents of different 

 breeds (biol.). 



crotaphite (krot'aflt) n. [Gk. krot- 

 aphos, of the temples.] The 

 temporal fossa (anat.). 



crotchet (kroch'et) n. [F. crochet, a 

 small hook.] A curved chaeta, 

 notched at the end (zool.). 



crown (krown) n. [L. corona, a 



crown.] The grinding surface of 

 a tooth ; the distal part of an 

 antler ; the crest, the head ; the 

 cup and arms of a crinoid (zool.). 



crucial ligaments, two ligaments 

 which connect the femur and tibia 

 in the knee-joint (anat.). 



cruciate (kroo'shlat, kroo'siat) a. [L. 

 crux, cross.] With leaves or petals 

 in the form of a cross (bot.) ; 

 Y-shaped or + -shaped, appl. 

 muscles, ligaments (anat.). 



cruor (kroo'or) n. [L. cruor, blood.] 

 The clots in coagulated blood 

 (phys.). 



cruorin (kroo'orln) n. [L. cruor, 

 blood.] Haemoglobin (phys.). 



crura cerebri, two cylindrical masses 

 at the base of the brain, they emerge 

 from the pons and disappear into 

 the substance of the cerebral hemi- 

 spheres (anat.). 



crural (kroo'ral) a. [L. crus, leg.] 

 Pert, the thigh (anat). 



crureus (kroo'reus) n. [L. crus, leg.] 

 The vastus internus muscle of the 

 thigh (a?iat.). 



crus (krus) n., crura (kroo'ra) plu. 

 [L. crus, leg.] The shank ; any 

 body likened to a leg or to a pair 

 of legs (anat.). 



crusta (krus'ta) n. [L. crusta, a 

 shell.] The ventral part of the 

 substantia nigra of the cerebral 

 peduncles (anat.) ; the cement layer 

 in teeth (zool.). 



crustaceous (krusta'shus) a. [L. 

 crusta, a shell.] With crustacean 

 characteristics (zool.). 



crypt (kript) n. [Gk. kryptos, hidden.] 

 A simple glandular tube or cavity 

 (anat.). 



cryptocarp (krip'tokarp) n. [Gk. 

 kryptos, hidden ; karoos, fruit.] A 

 fruit-like structure which is really 

 the sporophyte phase in the Red 

 Algae (bot.). 



cryptogam (krip'togam) n. [Gk. 

 kryptos, hidden ; gamos, union.] A 

 name given to that group of plants 

 for the supposed reason that sexual 

 reproduction was concealed ; cf. 

 phanerogam (bot.). 



cryptoneurous (krip'tonu'rus) a. [Gk. 

 kryptos, hidden ; neuron, nerve.] 

 With no definite or distinct nervous 

 system (zool.). 



