/hwis"leuhr, wis"-/ , n.
1. a person or thing that whistles.
2. something that makes a sound like a whistle: The windstorm was a 60-mile-an-hour whistler.
3. any of various birds whose wings whistle in flight, esp. the goldeneye.
4. thickhead (def. 2).
5. a large marmot, Marmota caligata, of mountainous northwestern North America, closely related to the woodchuck.
6. a horse afflicted with whistling.
7. Radio. a whistling sound heard on a radio, a type of interference caused by distant lightning.
[ bef. 1000; ME; OE hwistlere. See WHISTLE, -ER 1 ]