n. a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
n. 叶盖, 鳃盖骨[医] 盖, 岛盖, 盖(昆虫), 厣(软体动物), 鳃盖(鱼)