wireworm \ˈ ̷ ̷ˌ ̷ ̷\noun 1.: a worm that is the slender hard-coated larva of various click beetles and is very destructive to the roots of plants 2.: millipede; especially: one of the genus Julus that is often a pest in English gardens 3.: a common stomach worm (Haemonchus contortus) of ruminants — called also twisted wireworm