Definition of GARGOYLE
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a spout in the form of a grotesque human or animal figure projecting from a roof gutter to throw rainwater clear of a building; a grotesquely carved figure; a person with an ugly face… See the full definition

Proper use of the term gargoyle being the statues that drain water from buildings.

By the 13th century, those figures were being called gargoyles, a name that came to Middle English from the Old French word gargoule. The stone beasts likely earned that name because of the water that gargled out of their throats and mouths; the word gargoule is imitative in origin