The crossword solution for the term STEER HEAD is BUM, which is an acronym for 'Bovine Urogenital Myiasis, ' a type of parasitic infection that affects cattle. This infection is caused by the larvae of certain species of flies, which feed on the tissue of the animal's urogenital tract. The most common symptom of this infection is the presence of a large, hard lump on the HEAD of the affected animal, which is known as a STEER HEAD.