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 ?
Peter Elias, a skin biologist and lipid expert, believes that there is a complex interplay between lipid synthesis in these lamellar granules and cell proliferation.
Electron microscopic features of PRP include decreased numbers of keratin filaments and desmosomes, enlarged intercellular spaces, parakeratosis with lipid like vacuoles and large number of lamellar granules, and a focal split of the basal lamina at dermo-epidermal junction with lymphoid cells in the dermis.