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lip. ( 1 of an embryonic BLASTOPORE) the rim of the blastopore. ( 2 of a flower perianth) a group of perianth segments united to a greater or lesser extent, to form a distinct grouping thus divided from the rest of the perianth. ( 3 of vertebrates) one of two fleshy parts (upper and lower) surrounding the mouth.
either of the two fleshy parts or folds forming the margins of the mouth and functioning in speech. 2. Usually, lips. these parts as organs of speech: I heard it from his own lips. 3. a projecting edge on a container or other hollow object: the lip of a pitcher.