noun (plural oxen /ˈɒks(ə)n/)
- a domesticated bovine animal kept for milk or meat; a cow or bull: he was tall and broad and as strong as an oxSee cattle.
Old English oxa, of Germanic origin; related to Dutch os and German Ochse, from an Indo-European root shared by Sanskrit ukṣán 'bull'
The plural of ox is oxen. It does not follow the usual rule that plurals of words ending in -x are made by adding -es.