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precartilage

[prē-kär′tl-ĭj]
n.
  1. A closely packed aggregation of mesenchymal cells just prior to their differentiation into embryonic cartilage.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.