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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.
The mouth, also called the oral cavity, is the first part of the gastrointestinal tract (or alimentary canal). The boundaries of the mouth are formed by the lips, cheeks, floor of the mouth, and palate. The mouth contains the teeth and tongue and receives secretions from the salivary glands. It performs three main functions, which have to do with digestion, breathing, and speech.