The Collaborative International Dictionary of English v.0.48:
Squirter \Squirt"er\ (-[~e]r), n. One who, or that which, squirts. [1913 Webster]WordNet (r) 3.0 (2006):
squirter n 1: plaything consisting of a toy pistol that squirts water [syn: water pistol, water gun, squirt gun, squirter]