cyclostome

from WordNet (r) 3.0 (2006)

cyclostome
    n 1: primitive aquatic vertebrate

from The Collaborative International Dictionary of English v.0.48

Cyclostome \Cy"clo*stome\ (s?"kl?-st?m), Cyclostomous
\Cy*clos"to*mous\ (s?-kl?s"t?-m?s), a. (Zool.)
   Pertaining to the Cyclostomi.
   [1913 Webster]