Pollen definitions

pŏl'ən
The fine powderlike material whose individual grains contain the male reproductive cells of seed plants. Pollen is produced in the anther in angiosperms and in the male cone in gymnosperms.
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Pollen is a fine powdery substance that comes from the male part of flowers and often causes people to suffer an allergic reaction.

The fine yellow dust that comes from plants in the spring that makes you sneeze is an example of pollen.

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The fine, dustlike mass of grains that are produced in the anthers or microspore sacs of seed plants, containing the male sexual cells (gametophytes) of the plant.
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Powdery grains that contain the male reproductive cells of most plants. In gymnosperms, pollen is produced by male cones or conelike structures. In angiosperms, pollen is produced by the anthers at the end of stamens in flowers. Each pollen grain contains a generative cell, which divides into two nuclei (one of which fertilizes the egg), and a tube cell, which grows into a pollen tube to conduct the generative cell or the nuclei into the ovule. The pollen grain is the male gametophyte generation of seed-bearing plants. In gymnosperms, each pollen grain also contains two sterile cells (called prothallial cells), thought to be remnants of the vegetative tissue of the male gametophyte.
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A fine granular substance produced in flowers. Collective term for pollen grains or microspores produced in the anthers of flowering plants.
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Origin of pollen

From Latin pollen (“fine flour"), used by Linnaeus to describe the substance produced in flowers.