Freak  —n. 1 (often attrib.) Monstrosity; abnormal person or thing (freak storm). 2 colloq. A unconventional person. B fanatic of a specified kind (health freak). C drug addict. —v. (often foll. By out) colloq. 1 become or make very angry. 2 (cause to) undergo hallucinations etc., esp. As a result of drug abuse. 3 adopt an unconventional lifestyle.  freakish adj. Freaky adj. (-ier, -iest). [probably from dial.]