Entry 1 sense Webster, 1913 Toco /tōʹkō/ · To·co · IPA /ˈtoʊ.koʊ/ 01 n. A toucan (Ramphastos toco) having a very large beak. See Illust. under Toucan. 1. A toucan (Ramphastos toco) having a very large beak. See Illust. under Toucan.(Zool.) See: Toucan