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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.
mouth. MOUTH, n. 1. The aperture in the head of an animal, between the lips, by which he utters his voice and receives food. In a more general sense, the mouth consists of the lips, the gums, the insides of the cheeks, the palate, the salival glands, the uvula and tonsils. 2. The opening of a vessel by which it is filled or emptied; as the mouth of a jar or pitcher. 3. The part or channel of a river by which its waters are discharged into the ocean or into a lake.