Demantoid
Pronunciation : De*man"toid
Part of Speech : n.
Etymology : [G. demant diamond + -oid.] (Min.)
Definition : Defn: A yellow-green, transparent variety of garnet found in the Urals. It is valued as a gem because of its brilliancy of luster, whence the name.
Source : Webster's Unabridged Dictionary, 1913