Meaning of ectocommensal

ec•to•com•men•sal

Pronunciation: (ek"tō-ku-men'sul), [key]
— adj.
  1. (of an organism) living in a commensal relationship on the exterior of another organism.
—n.
  1. an ectocommensal organism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.