exarch

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exarch

[′ek‚särk]
(botany)
A vascular bundle in which the primary wood is centripetal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
you have been wont to do, that the most excellent Exarch may
Shortly after, the exarch Romanus died, "to the relief of