/duy'men huy"dreuh nayt'/ , n. Pharm.
a synthetic, crystalline, antihistamine powder, C 17 H 22 NO·C 7 H 6 ClN 4 O 2 , used in the treatment of allergic disorders and as a preventive for seasickness and airsickness.
[ 1945-50; DIME(THYL) + (AMI)N(E) + HYDR(AM)INE + -ATE 2 ]