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(Botany) botany (of a xylem strand) having the first-formed xylem surrounded by that formed later, as in fern stems. Compare exarch2, endarch
[C19: from mes(o)- + Greek arkhē beginning]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmɛz ɑrk, ˈmɛs-, ˈmi zɑrk, -sɑrk)

1. (of a primary xylem or root) developing from both the periphery and the center; having older cells surrounded by younger cells.
2. (of a life form) originating in a habitat with a moderate moisture supply.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Fischer + Makooi is the architect of record and interiors are designed by Brooklyn-based Mesarch Studio.
There will also be an artist talk today at 11am by architect and researcher at Mesarch Lab, University of Cyprus Petros Phokaides and the independent art and research collective Pick Name.
are endarch and others mesarch; some are amphicribral and others are
It is a septate cordaitalean axis with mesarch leaf traces and a non-sympodial vasculature.
We thank Mischell Craig, Mark Mesarch, Heather Root, Frank Soto, and Lanny Wit for technical assistance.