bidax(e dial.var.beat-axe(see beat n.3). 1778Pryce Min. Cornub. iv. i. 226 Then it is digged and broken to pieces with a bidax, or hedging tool.1806R. Polwhele Hist. Cornwall: Population 31 Where a man of York or Kent would employ a shovel or a spade, a Cornishman uses a bidaxe.