单词 metastoma 释义 ‖ metastoma Zool.|mtstm|Also anglicized metastome |mtstm|.[mod.L., f. Gr. - meta- + mouth.]1. The labium or lower lip of crustaceans.1859Huxley in Brit. Org. Rem., 1st Monograph 16 The Metastoma [in Pterygotus]..is an oval plate wit...