Amphipoda :: Amphipoda (n. pl.) A numerous group of fourteen -- footed Crustacea, inhabiting both fresh and salt water. The body is usually compressed laterally, and the anterior pairs or legs are directed downward and forward, but the posterior legs are usually turned upward and backward. The beach flea is an example. See Tetradecapoda and Arthrostraca..
Amphipodan :: Amphipodan (a.) Of or pertaining to the Amphipoda.
Amphipodous :: Amphipodous (a.) Of or pertaining to the Amphipoda.
Anapodeictic :: Anapodeictic (a.) Not apodeictic; undemonstrable.
Anarthropoda :: Anarthropoda (n. pl.) One of the divisions of Articulata in which there are no jointed legs, as the annelids; -- opposed to Arthropoda..
Anarthropodous :: Anarthropodous (a.) Having no jointed legs; pertaining to Anarthropoda.
Anisopoda :: Anisopoda (n. pl.) A division of Crustacea, which, in some its characteristics, is intermediate between Amphipoda and Isopoda..