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Dictionary

ac•ri•tarch

Pronunciation: (ak'ri-tärk"), [key]
—n. Paleontol.
any of various microfossils, of unknown biological affinities, having a central cavity enclosed by a wall of chiefly organic composition.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

acrimony

acritical

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