Stagworm \Stag"worm`\ (st[a^]g"w[^u]rm`), n. (Zool.) The larva of any species of botfly which is parasitic upon the stag, such as {Oestrus actaeon}, or {Hypoderma actaeon}, which burrows beneath the skin, and {Cephalomyia auribarbis}, which lives in the nostrils. [1913 Webster]