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brain sand

n.
  1. A gritty substance present in central nervous tissue or in the pineal gland.acervulus psammoma body
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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

Historical Examples

  • 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."