BAC- 



28 



BAS- 



bakterion, rod ; logos, discourse.] 

 The science dealing with the life- 

 history, structure, and effects of 

 Bacteria. 



bacteriolysin (bakte'rioli'sin) n. [Gk. 

 bakterion, small rod ; lyein, to loose.] 

 A substance which neutralizes the 

 toxicity of or destroys Bacteria 

 (phys.). 



balancers (bal'anserz) n. plu. [L. 

 bilanx, having two scales.] The 

 halteres or poisers of dipterous 

 insects (zoo!.}. 



balanoid (bal'anoid) a. [Gk. balanos, 

 acorn; eidos, like.] Pert, barnacles; 

 acorn-shaped (zool.). 



balausta (balos'ta) n. [Gk. balaustion, 

 tree-blossom.] Any fruit, many- 

 celled, many-seeded, indehiscent 

 and with tough pericarps (dot.}. 



baleen (balen') n. [L. balaena, whale.] 

 The horny plates attached to the 

 upper jaw of true whales ; whale- 

 bone (zool.). 



balm (bam) n. [L. balsamum, balsam.] 

 A fragrant garden plant ; a soothing 

 ointment (bot.). 



balsamiferous (bal'samif 6rus) a. [L. 

 balsamum, balsam ; ferre, to bear.] 

 Producing balsam (bot.). 



barb (barb) . [L. barba, beard.] One 

 of delicate thread-like structures 

 extending obliquely from a feather 

 rachis, and forming the vane (zool.} ; 

 a hooked hair-like bristle (dot.). 



barbate (bar'bat) a. [L. barba, beard.] 

 Bearded (bot., zool.). 



barbel (bfr'bel) n. [L. barbus, barbel.] 

 A tactile process arising from the 

 head of various fishes (zool.). 



barbellate (barbeTat, ba/bglat) a. 

 [L. barba, beard.] With stiff 

 hooked hair-like bristles (bot.). 



barbicel (bar'bisgl) n. [L. barba, 

 beard.] Small process on a feather 

 barbule (zool.). 



barbula (bar'bula) n. [L. barbula, 

 dim. of barba, beard.] Row of teeth 

 of the peristome of mosses (bot.). 



barbule (bar'bul) n. [L. barbula, dim. 

 of barba t beard.] One of the small 

 hooked processes fringing the barbs 

 of a feather (zool.). 



barotaxis (barbtak'sis) n. [Gk. baros, 

 weight ; taxis, arrangement.] The 

 reaction against a pressure stimulus 



(ba'sal) a. [L. basis, base.] 

 Pert, at or near the base, 

 basal ganglia, ganglia connecting 

 cerebrum with other centres 



(phys.). 



basal granule, a thickening at the 

 base of a flagellum, the centrosome, 

 in certain Protozoa (zool.). 



basal leaf, one of the leaves pro- 

 duced near the base of the stem 

 (bot.). 



basal placenta, arises from the proxi- 

 mal end of ovary (bot.). 



basal plates, certain plates in 

 Echinoderms, which are situated 

 at the top or near the top of the 

 stalk in Crinoids, and in Echinoids 

 form part of the apical disc (zool.). 



basal wall, the first plane of division 

 of the oospores of Ferns and Mosses 

 (bot). 



basale (basa'le, basal'a) ., basalia 

 (basa'lia) plu. [L. basis, base.] A 

 bone of variable structure arising 

 from the fusion of pterygiophores 

 and supporting fish fins (zool.). 



basement membrane, themembrane 

 of a gland containing the acini or 

 special secreting portions (anat.}. 



basialveolar (ba'sTalve'olar) a. [L. 

 basis, base ; alveolus, hollow.] Ex- 

 tending from basion to centre of 

 alveolar arch (anat.). 



basibranchial (ba'sibrang'klal) n. 

 [Gk. basis, base ; brangchia, gills.] 

 The median ventral or basal 

 skeletal portion of a branchial 

 arch (zool.}. 



basichromatin (ba'sikro'matin) n. 

 [Gk. basis, base ; chroma, colour.] 

 The deeply staining substance of 

 nuclear network ; chromatin (cyt.). 



baslconic sensillae, upright conical 

 clavate sense hairs, immovable at 

 their base and having thin chitinous 

 covering (zool). 



basicranial (ba'sikra'nTal) a. [Gk. 

 basis, base ; kranion, skull.] Situ- 

 ated at the base of the skull 

 (zool.). 



basidiophore (basid'Iofor) n. [Gk. 

 basis, base ; pherein, to bear.] A 

 sporophore which carries basidia 

 (bot.). 



basidlospore (bastd'iospor) n. [Gk. 

 basis, base ; sporos, seed.] A 

 spore or gonidium abstricted from 



