GLOSSARY 



685 



A-quat'ic (L. aqua, water). Living in water. 



Ar-bo're-al (L. arbor, tree). Tree-living. 



Ar-chen'ter-on (Gr. arche, beginning; en- 

 teron, gut). The primitive gut of an 

 embryo produced by gastrulation. 



Ar'ter-y (L. ateria, windpipe, artery). A 

 blood vessel carrying blood away from 

 the heart. 



Ar'thro-pod-a (Gr. arthron, joint; pons, 

 foot). A phylum of animals. 



Ar-tic'u-la-tion (L. atiictihis, joint). A joint. 



A-sex'u-al re-pro-duc'tion (L. a, not; sextts, 

 sex; L. re, again; prodticfio, produc- 

 tion). Reproduction without involving 

 sex cells. 



As-sim'i-la"tion (L. ad, to; similis, like). 

 The conversion of the end products of 

 digestion into protoplasm. 



A-sym'me-try (Gr. a, without; syn, with; 

 metron, measure). Without symmetry. 



At'a-vism (L. ataviis, ancestor). Resem- 

 blance to a remote ancestor. 



At'ro-phy ( Gr. a, not; trephein, to nourish ) . 

 The gradual regression of the whole 

 body or of its parts. 



Au'di-to-ry (L. audire, to hear). Pertaining 

 to hearing or ears. 



Au-to-nom'ic (Gr. autos, self; nomos, law). 

 Self-operating. 



Au'top-sy ( Gr. autos, self; optos, seen ) . The 

 dissection of a body (post-mortem) to 

 detenuine the cause of death. 



Au'to-some (Gr. autos, self; soma, body). 

 The chromosomes other than the sex 

 chromosomes. 



Au-tot'o-my ( Gr. autos, self; tome, cutting ) . 

 The automatic breaking off of a part 

 of the body, such as in arthropods. 



Ax'on ( Gr. axon, axle ) . The nerve fiber that 

 conducts the impulse away from the 

 cell body. 



Bi-lat'er-al sym'me-try (L. bis, twice; latus, 

 side; Gr. syn, with; metron, measure). 

 The arrangement of body parts so that 

 the right and left halves are mirror 

 images of each other. 



Bile pig'ments (L. bilis, bile; pingere, to 

 paint). The colored pigments of bile 

 (Bili Rubin, Bili Verdin) resulting 

 from hemoglobin breakdown. 



Bi'na-ry fis'sion (L. bi, two; fissus, cleft). 

 The type of reproduction (asexual) in 

 which division into two parts is ap- 

 proximately equal. 



Bi-no'mi-al no'men-cla-ture (L. bis, twice; 

 nomen, name). The international sys- 

 tem of naming animals whereby two 

 names are used. The first is generic, 

 the second specific. 



Bi-o-gen'e-sis ( Gr. bios, life; genesis, birth ) . 

 The doctrine that life comes only from 

 preexisting life. 



Bi-oro-gy (Gr. bios, mode of life; logos, 

 discourse). The science of plant and 

 animal life. 



Blas'to-coel (Gr. bkistos, bud; koilus, hol- 

 low). Cavity of the blastula. 



Blas'to-pore (Gr. blastos, bud; poros, pas- 

 sage). The opening into the archen- 

 teron of the gastrula. 



Blas'tu-la ( Gr. blastos, bud ) . The early em- 

 bryo in which the cells form a hollow 

 ball. 



Bow'man's cap'sule (named after Sir Wm. 

 Bowman, English physician. L. cap- 

 sula, a little box). The cup-like struc- 

 ture at the end of the kidney tubule 

 which surrounds the glomerulus. 



Bra'chi-al (L. brachium, arm). Pertaining 

 to the arm of a vertebrate. 



Bra'chi-ate (L. brachium, arm). A manner 

 of swinging from limb to limb in trees 

 with the hands, such as apes employ. 



Bron'chi-ole (Gr. bronchos, windpipe). A 

 tiny air tube in the lung. 



Bron'chus (Gr. bronchos, windpipe). One 

 of the two main air passages of the 

 trachea. 



Buc'cal ( L. bucca, cheek or mouth cavity ) . 

 The mouth cavity. 



Bud'ding (Gr. beutie, bag). Reproduction 

 by the splitting off and subsequent de- 

 velopment of a small portion of the 

 original animal. 



