AVE- 



BAC- 



avenaceous (avena'shus) a. [L. avena, 

 oats.] Pert, oats (dot.). 



avicularium (avTkula'rTum) n. [L. 

 avicula, dim. of avis, bird.] In 

 Polyzoa a modified zooecium with 

 muscular movable attachments re- 

 sembling a bird's beak (zool.). 



awn (on) ;/. [Ger. ahne } chaff.] The 

 "beard" of grass, grain, etc. (hot.). 



axial (ak'sial) a. [L. axis, axis.] Pert. 

 axis or stem (btol.). 



axial filament, the central filament 

 of any structure such as the stiff 

 radiating pseudopodia of some of 

 the Protozoa (zool.) 



axial sinus, a nearly vertical canal 

 in the Echinoderms opening into 

 the internal division of the oral ring 

 sinus, and communicating aborally 

 with the stone canal (zool.). 



axial skeleton, the skeleton of the 

 head and trunk, as ofip. the skeleton 

 of the limbs (zool.). 



axil (ak'sil) n. [L. axilla, arm-pit.] 

 The angle between a leaf or branch 

 and the axis from which it springs 

 (bot.). 



axile (ak'sil) a. [L. axilla, arm-pit.] 

 Pert., situated in or belonging to 

 the axis ; appl. placentation (bot.). 



axilemma (ak'silSm'a) n. [L. axis, 

 axis ; Gk. lemma, husk.] In medul- 

 lated nerve fibres, the sheath 

 supposed to surround the axial 

 cylinder (anat.). 



axilla (aksll'a) n. [ L. axilla, arm-pit.] 

 The ami-pit (anat.) ; an axil (bot.). 



axillary (ak'silari, aksil'ari) a. [L. 

 axilla, arm-pit.] Pert, the axil ; 

 growing in the axil, as buds (bot.) ; 

 pert, the arm-pit (anat.). 



axipetal (aksip'Stal) a. [L. axis, axis ; 

 Petere, to seek.] Passing towards 

 the attachment of the axon, appl. 

 nerve impulses (phys.). 



axis (ak'sis) n. [L. axis, axis.] The 

 main stem or central cylinder (bot.) ; 

 the fundamentally central line of a 

 structure ; the second cervical 

 vertebra (anat.). 



axis cylinder, the central tract of a 

 nerve fibre, the impulse transmitter 



axon (ak'son) n. [Gk. axon, axle.] 

 The axis-cylinder process of a multi- 

 polar nerve-cell (anat.). 



axoneme (ak'sonem) n. [Gk. axon, 



axle ; ntma, thread.] One of the 

 three threads of the main strand 

 of an infusorian stalk (zool.). 



axoiiost (ak'sonost) n. [Gk. axon, 

 axle ; osteon, bone.] The basal 

 portion of rods supporting the 

 dermotrichia of fin-rays (zool.). 



axopodium (ak'sopo'dlum) n. [Gk. 

 axon, axle ; pous, foot.] A pseudo- 

 podium with axial filament (zool.). 



axostyle (ak'sostll) n. [Gk. axon,a.\\& ; 

 stylos, pillar.] A slender flexible 

 rod of organic substance forming a 

 supporting axis for the body of 

 many Flagellates (zool.). 



azygobranchiate (azl'gobrang'kiat) a. 

 [Gk. a, without ; zygon, yoke ; 

 brangchia, gills.] Having the gills 

 or ctenidia not developed on one 

 side (zool.). 



azygomatous (a'zlgom'atus) a. [Gk. 

 a, without ; zygoma, a bar.] With- 

 out a zygoma or cheek-bone arch 

 (zool.). 



azygos (azi'gos, az'igos) n. [Gk. a, 

 without ; zygon, yoke.] An un- 

 paired muscle, artery, vein, process 

 (anat.). 



azygosperm (azi'gospe'rm) . [Gk. 

 a, without ; zygon, yoke ; sfierma, 

 seed.] An azygospore. 



azygospore (azl'gospor) n. [Gk. a, 

 without ; zygon, yoke ; sporos, seed.] 

 A spore developed directly from a 

 gamete without conjugation (bot.). 



azygous (azl'gus, az'Igus) a. [Gk. a, 

 without ; zygon, yoke.] Unpaired. 



B 



bacca (bak'a) n. [L. bacca, berry.] 

 A pulpy fruit (bot.). 



baccate (bak'at) a. [L. bacca, berry.] 

 Pulpy, fleshy (bot.). 



bacciferous (bakslf'grus) a. [L. bacca, 

 berry ; ferre, to bear.] Berry-pro- 

 ducing (bot.). 



bacciform (bak'slform) a. [L. bacca, 

 berry ; forma, shape.] Berry- 

 shaped (bot.). 



bacillus (basll'us) n. [L. bacillum, 

 small stick.] An elongated rod- 

 like bacterium ; a single-celled 

 fungus (bot.). 



bacteriology (bak'tertol'ojl) n. [Gk. 



