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]WordNet (r) 3.0 (2006):
paries n 1: (anatomy) a layer (a lining or membrane) that encloses a structure; "stomach walls" [syn: wall, paries]