a. Obs. rare. [f. L. effer-us (see EFFERE a. + -OUS.] Fierce, violent.
1614. Bp. J. King, Vitis Palatina, 38. From the teeth of that efferous beast,… preserue our root.
1657. Tomlinson, Renou’s Disp., 167*. To correct the efferous nature of the purgatives.
