brain sand

noun
\-ˌsand \

Medical Definition of brain sand 

: small grains of calcareous matter in the brain (as in the pineal gland) that occur especially in association with aging

called also acervulus, acervulus cerebri

Learn More about brain sand

Share brain sand

Comments on brain sand

What made you want to look up brain sand? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to express warning or disapproval

Get Word of the Day daily email!

Test Your Vocabulary

Autumn Words of the Day 2018

  • a-top-down-image-of-road-through-an-autumn-forest
  • Which is a synonym of fugacious?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!