the telephone, for which the blower is a slang term, especially in the United Kingdom

a supercharger on an internal-combustion engine

a ducted mechanical fan, especially when used in a heating, ventilating, and air-conditioning system

USS Blower (SS-325), a submarine of the United States Navy

Heterodon platirhinos, a non-venomous snake found in the United States.

a device to increase the draught of a locomotive (see blastpipe)