Lewis & Short

prae-tingo, nxi, nctum, 3, v. a., to dip in or moisten beforehand (poet. and in postclass. prose): semina practincta veneno, Ov. M. 7, 123: aqua, in quā fuerit candens ferrum praetinctum, Cael. Aur. Tard. 1, 4.