pollen grain

noun
a single granule of pollen.

Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Your sneeze could also be due to a reaction to a pollen grain.
Softened by moisture, the pollen grain releases proteins that chemically discern whether the new plant is genetically compatible.
They categorised every plant, bone, pollen grain and insect shell.
Cotton pollen is hypersensitive to water and rapidly uptakes water to the point at which the pollen grain ruptures and dies.
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