A gritty substance present in central nervous tissue or in the pineal gland.acervulus psammoma body
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- brain fingerprinting,
- brain freeze,
- brain gain,
- brain hormone,
- brain mantle,
- brain scan,
- brain someone,
- brain stem,
- brain sugar,
- brain swelling
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for brain sand
This pigment is apparently calcium phosphate, which still remains as the 'brain-sand' of the human pineal gland.The Origin of Vertebrates|Walter Holbrook Gaskell
It contains a small quantity of peculiar particles of gritty, sand-like substance, which are sometimes called "brain-sand."Clairvoyance and Occult Powers|Swami Panchadasi