any of a genus (Nyctalus) of bats; esp., a large brown species (N. noctula) of Europe and the British Isles
See noctule in American Heritage Dictionary 4
(nŏkˈcho͞olˌ)
noun
A large, reddish-brown insectivorous bat of the genus Nyctalus, found in Eurasia, Indonesia, and the Philippines and typically dwelling in the hollows of trees.