pila I. pila plural of pilum II. pi·la\ˈpīlə\noun Usage: capitalized Etymology: New Latin, from Latin pila ball — more at pile (hair) : the type genus of the family Pilidae comprising apple snails with dextral shells III. pi·la\ˈpēlə\noun (-s) Etymology: AmSpanish, from Spanish, basin, font, from Latin, pillar : a communal fountain