| 单词 | protostome |
| 释义 | protostome /proh"teuh stohm'/, n. Zool. any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm. Cf. deuterostome. [PROTO- + -STOME] |
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