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a. Either of two fleshy structures that surround the opening of the mouth in humans and other mammals.
b. In humans, the smooth brownish to reddish border of the lip.
2. A structure or part that encircles or bounds an orifice, as:
a. Anatomy A labium.
b. The margin of flesh around a wound.
c. Either of the margins of the aperture of a gastropod shell.
d. A rim, as of a vessel, bell, or crater.
3. Botany One of the two divisions of a bilabiate corolla or calyx, as in the snapdragon, or the modified median petal of an orchid flower.
4. The tip of a pouring spout, as on a pitcher.
5. Slang Insolent talk.
tr.v. lipped, lip·ping, lips
a. To touch the lips to.
b. To kiss.
2. To utter.
3. To lap or splash against.
4. Sports To hit a golf ball so that it touches the edge of (the hole) without dropping in.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.