资料来源 : pyDict

口后板

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Metastoma \Me*tas"to*ma\, Metastome \Met"a*stome\, n. [NL.
   metastoma, from Gr. meta` behind + sto`ma mouth.] (Zo["o]l.)
   A median elevation behind the mouth in the arthropods.