Toward the median plane of the body or of a part.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for mesad
Historical Examples of mesad
First branchia on each side attached to second somite just in front and mesad of the first setigerous tubercle.
Mesad of the branchial process of each parapodium of the first four pairs is a cirrus or cirriform process.