granule

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granule,

in astronomy: see photospherephotosphere,
luminous, apparently opaque layer of gases that forms the visible surface of the sun or any other star. The photosphere lies between the dense interior gases and the more attenuated gases of the chromosphere.
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granule

[′gran·yül]
(astronomy)
A convective cell in the solar photosphere, about 600 miles (1000 kilometers) in diameter.
(geology)
A somewhat rounded rock fragment ranging in diameter from 2 to 4 millimeters; larger than a coarse sand grain and smaller than a pebble.

granule

Geology a single rock fragment in gravel, smaller than a pebble but larger than a sand grain
References in periodicals archive ?
In addition, [alpha]-SPD (Gray platelet syndrome) has decreased alpha granules and is usually considered a macrothrombocytopenia.
It is unclear whether the pathophysiologic origin of the Gray platelet syndrome is due to premature release of alpha granules from the cell or abnormal signal transduction or calcium flux.
26) Platelets in the gray platelet syndrome, an alpha granule deficit, are characteristic for being pale, gray, and hypogranular on a Wright-stained blood smear.