n., pl., -re·ae (-rē-ē').
A sheath formed at the node of a stem by the fusion of two stipules, as in the rhubarb plant.
[Latin, greave.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.