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From: Webster's Revised Unabridged Dictionary (1913)

 Pol·len n.
 1. Fine bran or flour. [Obs.]
 2. Bot. The fecundating dustlike cells of the anthers of flowers. See Flower, and Illust. of Filament.
 Pollen grain Bot., a particle or call of pollen.
 Pollen mass, a pollinium. --Gray.
 Pollen sac, a compartment of an anther containing pollen, -- usually there are four in each anther.
 Pollen tube, a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule.