counterdrain noun 2verb 1forms 3 noun2 •A drain at the foot of the embankment of a canal or watercourse, for carrying off the water that may soak through. •An inserted device or other means by which excess fluid is drained off from a part of the body in which it accumulates. verb1 •To drain off excess fluid from a part of the body in which it accumulates. formscounterdrained · counterdraining · counterdrains