Boyd’s Bible Dictionary:
(ox). The Hebrew eleph means an ox (1 Kings 10:22; 2 Chron. 9:21; Job 40:15, margins).
Concise Bible Dictionary:
This is found only in the margin of the AV for “Behemoth” in Job 40:15; and in “elephants’ teeth” for “ivory” (1 Kings 10:22; 2 Chron. 9:21; compare Rev. 18:1-2). See IVORY.