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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.
What are lip cancers? Lip cancers are abnormal cells that grow out of control and form lesions or tumors on the lips. They are the most common type of oral cancers. These cancers develop in thin, flat cells â called squamous cells â that line the lips, mouth, tongue, cheeks, sinuses, throat, and hard and soft palates. Lip cancer and other kinds of oral cancers are types of head and neck cancers.