paries

from WordNet (r) 3.0 (2006)

paries
    n 1: (anatomy) a layer (a lining or membrane) that encloses a
         structure; "stomach walls" [syn: {wall}, {paries}]

from The Collaborative International Dictionary of English v.0.48

Paries \Pa"ri*es\, n.; pl. {Parietes}. [See {Parietes}.] (Zool.)
   The triangular middle part of each segment of the shell of a
   barnacle.
   [1913 Webster]