A fine granular substance produced in flowers. Technically a collective term for pollen grains (microspores) produced in the anthers of flowering plants. (This specific usage dating from mid 18th century.)
Fine powder in general, fine flour. (16th-century usage documented by the OED.) Example: "...and ther was good wyne of Gascoyne,... as well of pollen, as of other vitailes..." Froissart, Jean, 1338?-1410?; Berners, John Bourchier, Lord https//archive.org/details/chroniclefroiss00froigoog
To cover with, or as if with, pollen.
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