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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

granule

Geology a single rock fragment in gravel, smaller than a pebble but larger than a sand grain
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Heavy homogeneous TM pigmentation and pigment granule dusting on lens zonules and/or peripheral posterior lens surface were seen in all research eyes.
Association of kinesin and myosin with pigment granules in crustacean chromatophores.
Within the chromatophores of many amphibians and fish, pigment granules move as independent, individual organelles (Rogers et al., 1997; Rodionov et al., 1998): translocation is rapid and usually involves saltatory movement.
Pigment granules remain dispersed in cultured Xi-phophorus maculatus erythrophores perfused with 10 [mu]M A23187 and EGTA-buffered, [10.sup.-8] M free [Ca.sup.++] at [10.sup.-4] M [Ca.sup.++] erythrosome aggregation is almost complete (Oshima et al., 1988).
The implication that both centrifugal and centripetal pigment granule movements are actin-dependent is somewhat surprising, since all known myosin motors move only toward the plus ends of actin filaments.
We particularly emphasize that in patients complaining of color changes in the face, neck, and upper chest regions, discontinuing hydroxychloroquine treatment and ensuring protective measures against sunlight are important both in terms of preventing the formation of ochronotic pigment granules and cosmesis.
18-32 (24 [+ or -] 5.4) small roundish pigment granules were randomly scattered throughout the parasite cytoplasm.
The presence of numerous pigment granules near the distal end and base of the process in S.
Likewise, eyes can darken if the number of pigment granules increase or make darker pigment for some reason.
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).
Pigment aggregation is the cluster of individual pigment granules.