2 definitions found From WordNet (r) 2.0 [wn]: billy noun 1: a short stout club used primarily by policemen [syn: {truncheon}, {nightstick}, {billystick}, {billy club}] 2: male goat [syn: {billy goat}, {he-goat}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Billy \Bil"ly\, noun 1. A club; esp., a policeman's club. Also called {billy club} [1913 Webster +PJC] 2. (Wool Manuf.) A slubbing or roving machine.

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