oil slick

= slick.

offline, offprint, offset, offshoot, offshore, offside, offspring, oft, oft-times, often, ogle, ogre, ogrish, oh, Ohio, ohm, OHMS, oho, oil, oil rig, oil well, oil-bearing, oil-colour (also `oil-paint), oil-fired, oil-painting, oil-palm, oil-tanker, oilcake, oilcan, oilcloth, oiled, oilfield, oiliness, oilskin, oily, ointment, okapi, okay, okay (also OK), okey,