Definition of 「牜」:
1. Same as "牛" (ox). Used as a radical.
(Pictographic. The shape in oracle bone script is “牜”. The vertical stroke in the middle represents the face of the ox, the two upward curves represent the horns, and the two small strokes at the bottom indicate the ears.)
Members of the bovine family or closely related families. Mammals, robust in build, with hollow horns extending in a large arc from the skull. Strong, capable of plowing fields and pulling carts. In China, the predominant types are the yellow cattle and water buffalo. Cattle are considered large domesticated animals. — "Shuo Wen Jie Zi" (Explaining Simple and Compound Characters)