materia alba
Medical Dictionary

materia alba ma·te·ri·a al·ba (mə-tēr'ē-ə āl'bə)
n.
A white cheeselike accumulation of food debris, microorganisms, desquamated epithelial cells, and blood cells deposited around the teeth at the gumline.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Materia alba is always a great word to know.
So is flibbertigibbet. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
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