GLOSSARY 



The glossary is included as an aid in not only defining biological terms, but also in helping the stu- 

 dent pronounce them. Their origin is indicated as follows: Gr., Greek; L., Latin; M.E., Middle Enghsh; 

 A.S., Anglo-Saxon; Fr., French. Words that do not appear here may be found by referring to the index. 



Long words with two accented syllables contain both the primary accent (") and the secondary 

 accent ('). 



Ab-do'men (L. ahdere, to hide). The belly Ad'i-pose (L. adipo, fat). Pertaining to fat. 



region of animals, specifically in mam- Ad-re'nal gland ( L. ad, to; renes, kidneys; 



mals that part which extends from the 



diaphragm to the pelvis. 

 Ab'i-o-gen"e-sis ( L. a, not; hio, life; genesis, 



birth ) . The doctrine whereby life orig- 

 inates from the non-living world. 

 Ab-o'ral (L. ah, from; oris, mouth). The 



side opposite the mouth. 

 Ab-sorp'tion ( L. ah, away; sorbere, to suck 



in). The taking up of fluids or other 



substances by living systems. 

 Ac-cre'tion (L. accrescere, to increase). 



The addition of material to an inert 



mass of the same material. 

 Ac'e-tyl-cho"line. A chemical substance 



produced at or near para-sympathetic 



glans, acorn). A double endocrine 

 gland located on or near the kidney. 

 The two parts consist of the cortex and 

 the medulla, each secreting different 

 hormones. 



Ad-re'nal-in. A hormone produced by the 

 medullary portion of the adrenal 

 glands. 



Ad-sorp'tion (L. ad, to; sorhere, to suck in). 

 The attachment of molecules of one 

 substance to the surface of other sub- 

 stances. 



Affer-ent (L. afere, to bring). Carrying 

 toward. An afferent artery carries 

 blood to the lungs. 



nerve endings which is thought to be Ag-glu'ti-nin (L. ad, to; gltitinare, to glue). 



involved in conduction of nerve im- 

 pulses across synapses. 



A-coe'lo-mate (Gr. a, not; koilos, hollow). 

 Animals without a coelom. 



Ac'ro-meg"a-ly (Gr. akron, point, peak; 

 megas, big ) . An organic disease caused 

 by the hypersecretion of the anterior 

 pituitary after the long bones have 

 reached maturity. 



Ad-ap-ta'tion (L. ad, to; aptare, to fit). A 

 process by which an organism becomes 

 better suited to its environment. 



Ad-he'sion (L. adhaerere). A molecular 

 force at surfaces causing unlike mole- 

 cules to cling together. 



A substance in the blood which causes 

 cells or microorganisms to clump. 



Al'bi-nism (L. alhus, white). A condition 

 in which the normal pigment of the 

 skin, hair, and eyes is lacking. 



Al-i-men'tary ( L. aUmentum, from; alere, to 

 nourish). Pertaining to the digestive 

 tract. 



Al-lan'to-is (Gr. alias, sausage; eidos, form). 

 An extra embryonic membrane arising 

 as an outgrowth of the cloaca in rep- 

 tiles, birds, and mammals. 



Al-lele' (allelomorph) (Gr. allelon, of one 

 another). The alternative forms of a 

 gene having the same locus in homol- 



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