raindrop

[reyn-drop]
noun
a drop of rain.

Origin:
before 1000; Middle English rein-drop(e); Old English regndropa; see rain, drop

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To raindrop
Example sentences
When sunlight hits a raindrop, some photons glance off the surface.
Therefore, as a first estimate, the bullet is probably on the same order of
  magnitude as a raindrop.
If the raindrop is not present, follow the steps below.
Raindrop impact on some types of newly cultivated soils can cause the formation
  of surface seals and crusts.
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