Is it ensure, insure, or assure?
late 13c., from Old French oignement "ointment, salve, unguent," from Vulgar Latin *unguimentum, from Latin unguentum (see unguent). The first -t- emerged in Old French from oint, past participle of verb oindre "to anoint."
ointment oint·ment (oint'mənt)
A highly viscous or semisolid preparation usually containing medicinal substances and intended for external application.
Various fragrant preparations, also compounds for medical purposes, are so called (Ex. 30:25; Ps. 133:2; Isa. 1:6; Amos 6:6; John 12:3; Rev. 18:13).