Entry 2 senses · 2 variants Webster, 1913 Hooper /ho͞op'-ẽr/ · Hoop·er · IPA /huːpəɹ/ n. n. 01 n. One who hoops casks or tubs; a cooper. 1. One who hoops casks or tubs; a cooper. 02 n. The European whistling, or wild, swan (Olor cygnus); -- called also hooper swan, whooping swan, and elk. 1. The European whistling, or wild, swan (Olor cygnus); -- called also hooper swan, whooping swan, and elk.(Zool.) Also: hooper swan, whooping swan, elk