Of, relating to, or characterized by a symbiotic relationship in which one species is benefited while the other is unaffected.
An organism participating in a symbiotic relationship in which one species derives some benefit while the other is unaffected.
[Middle English, sharing a meal, from Medieval Latin commēnsālis : Latin com-, com- + Latin mēnsa, table.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.