Main Entry: whis·tler

Pronunciation: \ˈhwi-s(ə-)lər, ˈwi-\

Function: noun

Date: before 12th century

: one that whistles: as a : any of various birds; especially : any of numerous oscine birds (especially genus Pachycephala) found chiefly in Australia and South Pacific islands and having a whistling call b : a large marmot (Marmota caligata) of northwestern North America having a shrill alarm call c : a broken-winded horse d : a very-low-frequency radio signal that is generated by lightning discharge, travels along the earth's magnetic-field lines, and produces a sound resembling a whistle of descending pitch in radio receivers