προκενόω

A. empty beforehand, J. BJ 6.7.2:—Pass., Luc. Alex. 13, Hdn. 2.7.2.
II. Medic., drain or evacuate first, Ruf. ap. Orib. 7.26.7, Aret. CD 1.2, Gal. 10.798.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project