n.
Function: noun
Etymology: probably alteration of Middle English bakke, of Scandinavian origin; akin to Old Swedish natt bakka bat
Date: 1580
: any of a widely distributed order (Chiroptera) of nocturnal usually frugivorous or insectivorous flying mammals that have wings formed from four elongated digits of the forelimb covered by a cutaneous membrane and that have adequate visual capabilities but often rely on echolocation