Definition of pollen grain
: one of the granular microspores that occur in pollen and give rise to the male gametophyte of a seed plant
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Recent Examples of pollen grain from the Web
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For example, a single corn plant produces 2 [million] to 5 million pollen grains, and an ear of corn has a few hundred seeds.
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The peptides are the molecular signal that triggers the body’s immune system, so more peptides on a given pollen grain increases the severity of the allergy.
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In 2000, there were about 8,000 pollen grains per meter cubed.
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Bigelow has pulled cores from the bottom of lakes in Western Alaska to find pollen grains and bits of ancient plants.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pollen grain.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of pollen grain
1835
Learn More about pollen grain
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See words that rhyme with pollen grain Britannica.com: Encyclopedia article about pollen grain
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