Glossary 



HIS glossary is included as an aid to un- 

 derstanding the meaning of zoological terms; 

 frequent reference to it will prove very help- 

 ful. It is strongly recommended that the 

 beginning zoology student make a serious 

 systematic study of this list of words in an 

 effort to gain facility in the use of the vo- 

 cabulary in this field. 



Pronunciation is shown by the division of 

 words into syllables by hyphens and by ac- 

 cent marks, both primary (") and secondary 



(')• 

 The derivations of the terms are included 



to give a better understanding of their mean- 

 ing and a greater competence in their use. 

 Abbreviations used for the origins of terms 

 are: L., Latin; Gr., Greek; Sp., Spanish; Fr., 

 French; A.S., Anglo-Saxon; N.L., New Latin; 

 O.F., Old French; M.E., Middle English. 



Definitions of terms not included in the 

 glossary can be found in the text; see the 

 index for page numbers. 



Ab-do'men (L., belly). The body region that 

 contains the viscera; in mammals, limited 

 to the part of the body extending from the 

 diaphragm to the pelvis. 



Ab-duc'tor (L. abducere, to lead away). A 

 muscle that draws a part away from the 

 median line or center. 



Ab'i-o-gen"e-sis (L. a, not; Gr. bios, life; gene- 

 sis, origin). An old idea, now discredited, 

 that living things may arise from nonliving 

 objects. Spontaneous generation. See Bio- 

 genesis. 



Ab-o'ral (L. ab, from; oris, mouth). Opposite 

 the mouth. 



Ab-sorp'tion (L. absorbere, to suck in). The 

 taking in of fluids or other substances by 

 cells or tissues. 



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

 process of growth in which material is added 

 to the outside in nonliving matter. 



Ac-e-tab'u-lum (L., vinegar cup). The cup- 

 shaped socket of the hip into which the 

 femur fits. 



Ac'e-t>'l-cho"line. A substance liberated at or 

 near ner\'e endings. It may be involved in 

 conduction across synapses and is known to 

 be associated with many parasympathetic 

 nerves. 



661 



