adj. & n.
adj. 1 Biol. of, relating to, or exhibiting commensalism. 2 (of a person) eating at the same table as another.
n. 1 Biol. a commensal organism. 2 one who eats at the same table as another. commensality n.
[ ME f. F commensal or med.L commensalis (in sense 2) (as COM-, mensa table) ]