单词 petasma 释义 petasma Zool.|ptzm|[a. Gr. something spread out.]In prawns of the family Penidea, a membranous appendage attached to the first pair of pleopods.1888C. S. Bate in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXIV. 230 The pleopods [o...