Hypostome

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Hypostome \Hy"po*stome\, Hypostoma \Hy*pos"to*ma\, n. [NL.
     hypostoma, fr. Gr. "ypo` beneath + ? mouth.] (Zool.)
     The lower lip of trilobites, crustaceans, etc.
     [1913 Webster]