Lewis & Short

empīrĭce, ēs (-ca, ae, Marc. de Med. 6), f., = ἐμπειρική, empiricism in medicine, i. e. a system founded wholly on practice, Plin. 29, 1, 4, § 5.
Hence, empīrĭcus, i, m., an empiric, a physician whose knowledge of medicine is derived from experience only, Cic. Ac. 2, 39, 122 (in Cels. praef. and 5 init., written as Greek); their writings were called empīrĭca, ōrum, n., Plin. 20, 12, 48, § 120.