Lewis & Short

quā̆drantārĭus, a, um, adj. [quadrans].

  1. I. Prop., of or belonging to a quarter, relating to a fourth part: in tabulis quadrantariis, quas ait ab Hirtuleio institutas, i. e. new accounts reducing all debts to one fourth, Cic. Font. 1, 2.
  2. II. In partic., relating to a quarter of an as (as a coin), that costs a quarter of an as, etc.: res quadrantaria, i. e. a bath (because a quarter of an as was the price of a bath; v. quadrans, II. B), Sen. Ep. 86, 8: mulier, of Clodia, wife of Metellus, who sold herself for a bath, Cic. Cael. 26, 62; she is also called Clytaemnestra quadrantaria, because, like Clytaemnestra, she destroyed her husband, Cael. ap. Quint. 8, 6, 53.