Definition of: lip

(lip) noun
1. One of the two folds of flesh that bound the mouth and cover the teeth. ♦ Collateral adjective: labial.
2. Hence, from the use of these organs in speaking, speech; especially, impertinent speech; sauciness.
3. Anything having the appearance or purpose of a lip, as of a cup, bell, crater, wound, etc.
4. An embouchure.
5. Any structure that bounds an orifice, slit, or groove.
6. Bot. Either of the two large lobes of a bilabiate corolla or calyx; also, in orchids, a labium.
—to keep a stiff upper lip To keep up one's courage; be stoical.
—v. lipped, lip·ping v.t.
1. To touch with the lips; apply the lips to.
2. Archaic To utter with the lips; whisper.
3. In golf, to hit the ball so that it strikes the edge of (the cup) without dropping in.
—v.i.
4. To adjust the lips to the mouthpiece of a wind instrument for playing.
—adjective
1. Of or pertaining to the lips or a lip.
2. Characterized by or made with the lips.
3. Made with the lips only; superficial; insincere: lip service. [OE lippa]