com·men·sal 
(kə-mĕnsəl)
(kə-mĕnsəl)adj.
Of, relating to, or characterized by a symbiotic relationship in which one species is benefited while the other is unaffected.
n.
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.]
com·mensal·ly adv.
- learned
- learnedly
- learnedness
- learner
- learning
- learning curve
- learning difference
- learning disability
- learning-disabled
- learning disorder
- learnt
- leasable
- lease
- leaseback
- leasehold
- leaseholder
- leaser
- leash
- leash law
- leasing
- least
- least common denominator
- least common multiple
- least of all
- least squares