granule

(redirected from pigment granules)
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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 ?
There exist numerous pigment granules, sparsely scattered small vesicles of various shapes, mitochondria, Golgi apparatuses, and myeloid bodies (Plate 5).
A new range of Aquavex[R] AD aluminum pigment granules for water-based metallic inks has been developed to provide improved adhesion and rub resistance on paper, film, and board.
So eye colour lightens when the pigment granules in the front layer of the iris - which give it its colour - drop in number through age.
However, the few processes representing putative nerve endings may indicate an efferent innervation known also from other chelicerate eyes, which have been shown to induce the movements of pigment granules according to a circadian clock in scorpions (Fleissner & Schliwa 1977; Fleissner 1986).
But if the feed zone is too hot, pigment granules melt too quickly and become encrusted on the screw.