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jaculator (jak'ulator) n. [L. jaculatus, 

 thrown.] A placental process, 

 usually hook-shaped, of certain 

 fruits (hot.). 



jaculatory (jak'ulatorf) a. [L. jacu- 

 latorius, throwing.] Darting out; 

 capable of being emitted (zoo/.). 



jaculatory duct, a portion of the 

 vas deferens in many animals, 

 which is capable of being pro- 

 truded (zool.}. 



jaculiferous (jak'ulif'erus) a. [L. 

 jaculum, a dart ; ferre, to carry.] 

 Bearing dart-like spines. 



jaw (jo) n. [Akin to chaw, cheivl\ 

 A structure of vertebrates supported 

 by bone or cartilage, naked or 

 sheathed in horn, or bearing teeth 

 or horny plates, forming part of 

 the mouth, and helping to open 

 or shut it ; in invertebrates, a 

 similarly placed structure. 



jaw-bone, the mandible. 



jaw-foot, a maxillipede of Arthro- 

 pods (zool.}. 



jecorin (jSk'orin) n. [L.jecur, liver.] 

 A lecithin-like phosphorized sub- 

 stance present in many of the 

 organs of the body in minute 

 quantities, and soluble in ether 

 (phys.}. 



jejunum (jejoon'um) n. [L. jejunus, 

 empty.] The part of the small 

 intestine stretching from the duo- 

 denum to the ileum (anat.}. 



jelly of Wharton, the mucoid tissue 

 found in connection with the vessels 

 of the umbilical cord (anat.}. 



jubate (joob'at) a. [L. jubatus, 

 maned.j With mane-like growth 

 (zool.\. 



jugal (joog'al) n. [L. jugum, yoke.] 

 The malar bone, between maxilla 

 and squamosal. 



jugate (joog'at) a. [L.jugum, yoke.] 

 Having pairs of leaflets (bot.} ; 

 furnished with a jugum (zool.). 



jugular (joog'ular, jug-) a. [L. jugu- 

 lum, a collar-bone.] Pert, neck or 

 throat ; appl. ventral fish-fins be- 

 neath and in front of pectoral fins 

 (zool.). 



jugulum (joog'ulum, jug-) n. [L. 

 jugulum, collar-bone.] The fore- 

 neck region of a bird's breast ; in 

 Insects, the jugum of the wing 

 (zool.}. 



jugum (joog'iim) n. [L.jugum, yoke.] 

 A pair of opposite leaflets ; a ridge 

 on the mericarp of umbelliferous 

 plants (dot.} ; a small forewing lobe 

 of a very few moths with no fren- 

 ulum (zool.} ; the union of the small 

 sphenoidal wings in the first year 

 after birth (anat.}. 



juice (joos) n. [L.jus, mixture.] The 

 fluid contained in animal flesh or 

 plant structure (phys.). 



Jurassic (jooras'ik) a. [Jura moun- 

 tains.] Occurring in the middle 

 Secondary rock-system, the eighth 

 of the thirteen systems (pal.}. 



K 



kakogenesis (kak'ojen'gsls) n. [Gk. 

 kakos, bad ; genesis, descent.] In- 

 ability to hybridize (biol.}. 



kalldium (kalid'ium) n. [Dim. Gk. 

 kalia, a hut.] A form of sporocarp 

 (bot.}. 



kalymmocytes (kaltm'osits) n. plu. 

 [Gk. kalymma, covering ; kytos, 

 cell.] In Ascidians, certain follicle- 

 cells which migrate into the egg 

 after maturation (zool.}. 



karyaster (karias'ter) n. [Gk. karyon, 

 nucleus ; aster, star.] A star-shaped 

 group of chromosomes (cyt.}. 



karyenchyma (kar'Igng'kTma) n. [Gk. 

 karyon, nucleus ; engchyma, in- 

 fusion.] Nuclear sap (cyt.}. 



karyogamy (kar'iog'aml) n. [Gk. 

 karyon, nucleus ; games, union.] 

 Union and interchange of nuclear 

 material (cyt.}. 



karyokinesis (karfokine'sis) n. [Gk. 

 karyon, nucleus ; kinein, to change.] 

 Indirect cell-division; mitosis (cyt.}. 



karyolymph (kar'iolimf) n. [Gk. 

 karyon, nucleus ; L. lympha, water.] 

 Nuclear sap (cyt.}. 



karyolysls (kar'iol'lsls) n. [Gk. kar- 

 yon, nucleus ; lyein, to loosen.] 

 Supposed dissolution of the nucleus 

 in mitosis (cyt.}. 



karyomlcrosome (kar'iomi'krosom) 11. 

 [Gk. karyon, nucleus ; mikros, small ; 

 soma, body.] A nuclear granule 



(cyt.}. 



