noun Mineralogy.

a brilliant green variety of andradite garnet, used as a gem.

Origin of demantoid

1890–95; < German, equivalent to (obsolete) Demant diamond (< Middle High German diemant < Old French diamant) + -oid -oid
Also called Uralian emerald. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for demantoid

Historical Examples of demantoid

British Dictionary definitions for demantoid



a bright green variety of andradite garnet

Word Origin for demantoid

C19: from German, from obsolete Demant diamond, from Old French diamant + -oid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012