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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.
liposome. n. 1. (Biochemistry) a particle formed by lipids, consisting of a double layer similar to a natural biological membrane, enclosing an aqueous compartment.ipÂ·oÂ·some. n. A microscopic artificial vesicle consisting of an aqueous core enclosed in phospholipid molecules, used to convey vaccines, drugs, or other substances to target tissues. lipâ²oÂ·soâ²mal adj.