Ament 



A pendulous, spike-like cluster of flowers as in the oaks, 

 willows, and birches, syn. Catkin. 



Amentaceous 



Refers to plants with aments or catkins. 



Ametoecious 



Refers to a parasite that is restricted to a single host. 



Amino Acid 



A class of organic compounds containing nitrogen, large 

 numbers of which become linked together to form proteins 

 (q. v.); each one containing at least one amino group (-NH 2 ) 

 and at least one carboxyl (-COOH) group. 



Amitosis 



Direct division of the nucleus of the cell without mitosis 

 (q. v.). 



Animate 



A compound of ammonium sulfate used as an herbicide 

 (q. v.). 



Ammocolous 



Refers to an organism that grows in sand. 



Ammonification 



The formation of ammonium compounds from organic 

 materials containing nitrogen. 



Ammophilous 



See Ammocolous. 



Amnicolous 



Refers to organisms inhabiting sandy banks of rivers. 



Amniote 



An animal such as reptile, bird, or mammal the embryos 

 of which develop within a fluid-filled sac. 



17 



