Boyd’s Bible Dictionary:
(bellow). A term used generically for ox, cattle (Psa. 22:12). Bullock (Isa. 65:25); cow (Ezek. 4:15); oxen (Gen. 12:16). The “wild bull” (Isa. 51:20), and the “wild ox” (Deut. 14:5), mean probably the oryx.
Concise Bible Dictionary:
See Ox.
Strong’s Dictionary of Hebrew Words:
Meaning:
from the same as 5696; a (male) calf (as frisking round), especially one nearly grown (i.e. a steer)