'Hypostome' definitions:

Definition of 'Hypostome'

From: 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]