exasperate

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exasperate

Botany having a rough prickly surface because of the presence of hard projecting points
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

exasperate

[ig′zas·pə·rət]
(biology)
Having a surface roughened by stiff elevations or bristles.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.