Source : Webster's Revised Unabridged Dictionary (1913)

Integument \In*teg"u*ment\, n. [L. integumentum, fr. integere to
   cover; pref. in- in, on + tegere to cover: cf. F.
   int['e]gument. See 1st {n-}, and {Tegument}.]
   That which naturally invests or covers another thing, as the
   testa or the tegmen of a seed; specifically (Anat.), a
   covering which invests the body, as the skin, or a membrane
   that invests a particular.

Source : WordNet®

integument
     n : an outer protective covering such as the skin of an animal
         or a cuticle or seed coat or rind or shell