Definition of pollen grain in English:

pollen grain

Syllabification: pol·len grain

Entry from US English dictionary

noun

Each of the microscopic particles, typically single cells, of which pollen is composed. Pollen grains have a tough coat that has a form characteristic of the plant producing it.

Definition of pollen grain in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose