A' nal, pertaining to the anus, or hinder opening of the intestine.
Anal fin, a ventral median fin of fishes, just back of the anus.
Animal Communities, associations of many animals of the same species.
An ten' na, a segmented sensory appendage on the head of an arthropod.
An ten' nule, a small antenna.
An te' ri or, farther forward, in front of; at the head or forward end.
A or' ta, a large artery arising at the heart and forming the trunk of the arterial system.
Ap' er ture, an opening.
Ap pend' age, a projection from the body, usually one of a pair.
Ar throp' o da, a group of animals with a segmented trunk and paired, segmented appendages.