n.
A symbiotic relationship between organisms in which one species is harmed or inhibited and the other species is unaffected.
[Probably A-1 + (COM)MENSALISM.]
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.
