sand

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sand

 [sand]
material occurring in fine gritty particles.
brain sand sandy matter about the pineal gland and other parts of the brain.

sand

(sand),
The fine, granular particles of quartz and other crystalline rocks, or a gritty material resembling sand.
[A.S.]

sand

(sand)
The fine granular particles of quartz and other crystalline rocks, or a gritty material resembling sand.
[A.S.]