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i•so•tre•tin•o•in

Pronunciation: (ī"sō-tri-tin'ō-in, -oin), [key]
—n. Pharm.
a yellowish-orange to orange crystalline powder, C₂₀H₂₈O₂, used in the treatment of cystic acne.

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

isotopy

isotropic

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