Glossary 



This glossary has been prepared as an aid in expanding the scientific vo- 

 cabulary of the biology student. All of the scientific words that are used in 

 the book that might not be in the vocabulary of the college freshman are listed 

 together with their pronunciation and meaning. For a fuller understanding 

 of a word it is suggested that the student look the word up in the index and 

 read about it more fully in the text. 



The definitions given are in relation to the biological usage of the word. 



Scientific names of animals and groups of animals are not included in the 

 glossary. These, together with their derivations, may be found at the close of 

 the chapters in which the animals are studied. 



Pronunciations are given according to usage by competent biologists, such 

 as is heard at national scientific gatherings. The simplified system of phonetics 

 used for the vowels is as follows : 



a, as in am, cap. I, as in bit, rid. 



a, as in day, hay. i, as in bite, ride, 



a, as in was, alone. 6, as in hot, bSb. 



a, as in all, palm. 6, as in horse, corn. 



e, as in get, red. o, as in hole, rope, 



e, as in be, the. u, as in cup, hurl, 



e, as in under, dancer. u, as in mule, duty. 



fl, as in urn, furl. 



Ab- (ab), prefix meaning "out of" or "away from". 



Abdomen (ab-do'-men or ab'-do-men), the region of the trunk posterior to the 



thorax. 

 Abductor (ab-duk'-ter), refers to a muscle that draws an appendage away from 



the mid-line of the body. 

 Aboral (ab'-o-ral), the direction away from the mouth ; in contrast or oral which 



refers to the mouth. 

 Abyssal (a-bis'-al), the bottom of the sea. 

 Acromegaly (ak-ro-meg'-a-li), disease caused by hypersecretion of the growth 



hormone of the pituitary gland after physical maturity. 

 Ad- (ad), prefix meaning "to" or "towards". 

 Adductor (ad-duk'-ter), refers to a muscle that draws an appendage toward 



the mid-line of the body. 

 Adrenal (ad-re'-nal), pertaining to a pair of endocrine glands just above the 



kidneys. 

 Adrenalin (ad-ren'-a-lin), hormone secreted by the medulla of the adrenal 



glands. 

 Allantois (a-lan'-t6iz), an outgrowth of embryonic birds and reptiles that takes 



care of respiration through the shell. 



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