SPA- 



295 



SPE- 



spatulate (spat'ulat) a. [L. spatula, 

 spoon.] Spoon-shaped ; appl. a 

 leaf with broad, rounded apex, 

 thence tapering to the base (bot.). 



spawn (spon) n. [M.E. spaivnen, to 

 spawn.] The collection of eggs de- 

 posited by Fishes, Frogs, etc. (zoo/.); 

 mycelium of certain Fungi (bot.). 



species (spe'shigz) n. [L. species, a 

 particular kind.] A term used in 

 the natural sciences to denote a 

 group of closely-allied individuals : 

 the division is purely artificial (biol.). 



specific (spgstflk) a. [L. species, a 

 particular kind ; facere, to make.] 

 The second name in binomial 

 nomenclature, which see ; appl. 

 characteristics distinguishing a 

 species (biol.). 



speleology (spe'leSl'qji) n. [Gk. 

 spelaion, cave ; logos, discourse.] 

 The study of cave life. 



sperm (spgrm) n. [Gk. sperma, seed.] 

 The male fertilizing element ; a 

 spermatozoon (biol.). 



sperm aster, the rayed structure 

 surrounding the centrosome (emb.). 



sperm cell, a male reproductive cell 

 or spermatozoon. 



sperm centrosome, the end-knob of 

 the axial filament of a spermatozoon, 

 situated on the middle piece just 

 at the base of the head ; according 

 to some writers, the small body at 

 the apex of the head (cyt.). 



sperm nucleus, the nucleus of the 

 spermatozoon ; the male pro-nucleus 

 (cyt.). 



spermaduct (speVmadukt) n. [Gk. 

 sperma, seed ; L. ducere, to lead.] 

 A duct for conveyance of spermato- 

 zoa (zool.). 



spermarium, a spermary. 



spermary (speYmari) n. [Gk. sperma, 

 seed.] An organ in which sper- 

 matozoa or antheridia are pro- 

 duced (biol.). 



spermatangium (speYmatan'jIum) n. 

 [Gk. spertna, seed ; anggeion, a 

 vessel.] The antheridium of certain 

 Algae (hot.}. 



spermatheca (speYmathe"ka) n. [Gk. 

 sperma, seed ; theke, a case.} A 

 receptaculum seminis ; a sac in the 

 female of many invertebrates in 

 which spermatozoa are stored till 

 required (zool.). 



spermatic (spgrmat'lk) a. [Gk. 

 sperma, seed.] Pert, spermatozoa 

 or testis (zool.). 



spermatid (speVmatld) n. [Gk. 

 sperma, seed.] A cell arising by 

 division of the secondary spermato- 

 cytes and becoming a spermatozoon 



spermatlferous (spSrmatlf'e'rus) a. 

 [Gk. sperma, seed ; L. ferre, to 

 carry.] Bearing spermatia (tot.). 



spermatiophore (speYmat'iofor) n. 

 [Gk. sperma, seed ;pherein, to bear.] 

 A spermatia-producing sporophore 

 (hot.). 



spennatium (spfirma'shlum) n. [Gk. 

 sperma, seed.] A non-motile sperm 

 of red Algae ; a small cell formed 

 by abstrictions of filaments of 

 spermogonia of wheat Rust (tot.). 



spermatize (speVmatlz) v. [Gk. 

 sperma, seed.] To impregnate 

 (biol.). 



spermatoblast (speYmatoblast) n. 

 [Gk. spertna, seed ; blastos, bud.] 

 A spermatid ; a Sertoli cell (cyt.). 



spermatoblastic (speYmatoblas'tlk) a. 

 [Gk. sperma, seed ; blastos, bud.] 

 Sperm-producing. 



spermatocyst (speYmatosIst) n. [Gk. 

 sperma, seed ; kystis, a bladder.] 

 A seminal sac. 



spermatocyte (speVmatosit) n. [Gk. 

 sperma, seed ; kytos, hollow.] A 

 cell arising by growth from a 

 spermatogonium ; a primary sper- 

 matocyte divides to form two 

 secondary spermatocytes, each of 

 hich gives rise to two spermatids 



.. 



spermatogenesis (sp6r / mat6j6n / 6sls) 

 n. [Gk. sperma, seed ; genesis, 

 origin.] The process of sperm- 

 formation (biol.). 



spermatogenetic (s pg r'matbj 6 n e" t'lk) 

 a. [Gk. spertna, seed ; genesis, 

 descent.] Pert, sperm-formation ; 

 sperm-producing. 



spermatogenic, sperma togenous, 

 spermatogenetic. 



spermatogonial (spgr'matogo'nlal) a. 

 [Gk, sperma, seed ; gonos, offspring.] 

 Pert, a spermatogonium. 



spermatogonium (speVmatogo'nlum) 

 n. [Gk. sperma, seed ; gonos, off- 

 spring.] A primordial male gerra- 

 cell (cyt.). 



