wash-ball UK /ˈwɒʃˌbɔːl/US /ˈwɔʃˌbɔl/ noun1 •(no longer used) A ball or cake of substance used for bathing or personal cleansing, or to produce a lather for shaving; a ball of soap.Magmata, um. The dregs of ointment, wash-balls. — 1662 formswash balls · wash-balls