What do a.m. and p.m. stand for?

pollen grain

a single granule of pollen.
Origin of pollen grain
1825-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pollen grain
  • 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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