The Collaborative International Dictionary of English v.0.48:
Marmoreal \Mar*mo"re*al\ (m[aum]r*m[=o]"r[-e]*al), Marmorean \Mar*mo"re*an\ (m[aum]r*m[=o]"r[-e]*an), a. [L. marmoreus, fr. marmor marble: cf. F. marmor['e]en. See Marble.] Pertaining to, or resembling, marble; made of marble. [1913 Webster]WordNet (r) 3.0 (2006):
marmoreal adj 1: of or relating to or characteristic of marble [syn: marmorean, marmoreal]