Definition of "whistler"

Someone or something that whistles, or who plays a whistle as a musical instrument.  examples

Any of several passerine birds of the genera Pachycephala and Coracornis, of Australasia and the western Pacific.  examples

Any bird that whistles or is noted for its whistling vocalisations (applied regionally to various specific species).  quotations  examples

A goldeneye (any of certain ducks of genus Bucephala).  examples

A whistling marmot (Marmota caligata).  examples

A mountain beaver (Aplodontia rufa).  examples

An audio-frequency electromagnetic wave produced by atmospheric disturbances such as lightning.  examples

A broken-winded horse.  examples

(slang, obsolete) The keeper of a whistling shop, or shebeen.