epi-

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epi-

[′ep·ē]
(organic chemistry)
A prefix used in naming compounds to indicate the presence of a bridge or intramolecular connection.
(science and technology)
Prefix denoting upon, beside, near to, over, outer, anterior, prior to, or after.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.