"tank for holding oil," 1862, from oil (n.) + tank (n.).
oil-can
oil-cloth
oiler
oil-mill
oil-skin
oil-tank
oil-well
oily
oink
*oi-no-
ointment
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}