growl·er 
(groulər)
(groulər)n.
1. One, such as a dog, that growls.
2. A small iceberg.
3. Electricity An electromagnetic device with two poles, used for magnetizing, demagnetizing, and finding short-circuited coils.
4. Informal A pail or other container used for carrying beer, especially a half-gallon or gallon glass jug with a gasket or screw cap.
[Sense 4, from the sound made by carbon dioxide escaping from under the lids of metal pails in which beer was carried in the past .]