*gaper*

n. 1. One who gapes. [ 1913 Webster ]

2. (Zool.) (a) A European fish. See 4th Comber. (b) A large edible clam (Schizothærus Nuttalli), of the Pacific coast; -- called also gaper clam. (c) An East Indian bird of the genus Cymbirhynchus, related to the broadbills. [ 1913 Webster ]