ointment (n.)

"unctuous medicinal salve for external application," late 13c., oynement, from Old French oignement "ointment, salve, unguent," from Vulgar Latin *unguimentum, from Latin unguentum (see unguent). The first -t- emerged early 14c. in English, from Old French, which got it by influence of oint, past participle of the verb oindre "to anoint."