pollen

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The fine powderlike material consisting of pollen grains that is produced by the anthers of seed plants.

Century Dictionary and Cyclopedia

1. n. A fine yellowish dust or powder produced in the anther of a flower (whence it is discharged when mature), which when magnified is found to consist of separate grains of definite size and shape; the male or fecundating element in flowering plants: the homologue of the microspore in cryptogams. The individual grains are usually single-celled and of a globular or oval form, but they may occasionally be composed of two or several cells, curiously irregular in shape. They are often beautifully ornamented with spines, angles, lines, etc., and while they are very uniform in the same species they often differ widely in different species or families. Pollengrains are usually formed in fours by the division of the contents of mother cells into two parts and these again into two parts. Each grain has two coats, the inner of which is called the intine and the outer the extine. See pollen-tube.
2. To cover or dust with pollen; supply with pollen. Tennyson, Voyage of maeldune.

Wiktionary

1. n. A fine granular substance produced in flowers. Collective term for pollen grains or microspores produced in the anthers of flowering plants.

GNU Webster's 1913

1. n. obsolete Fine bran or flour.
2. n. (Bot.) The fecundating dustlike cells of the anthers of flowers. See Flower, and Illust. of Filament.

WordNet 3.0

1. n. the fine spores that contain male gametes and that are borne by an anther in a flowering plant