Polyanthus \Pol`y*an"thus\, n.; pl. {Polyanthuses}. [NL., fr. Gr. ? rich in flowers; poly`s many + ? flower.] [Written also {polyanthos}.] (Bot.) (a) The oxlip. So called because the peduncle bears a many-flowered umbel. See {Oxlip}. (b) A bulbous flowering plant of the genus {Narcissus} ({N. Tazetta}, or {N. polyanthus} of some authors). See Illust. of {Narcissus}.