Main Entry: maul
Etymology: Middle English malle mace, maul, from Old French mail, from Latin malleus; akin to Old Church Slavonic mlatu hammer, Latin molere to grind -- more at MEAL
Date: 13th century
: a heavy often wooden-headed hammer used especially for driving wedges; also : a tool like a sledgehammer with one wedge-shaped end that is used to split wood
In short, a hammer with an oversize square head I happen to use for busting concrete...and on occasion, bones...