WordReference Random House Unabridged Dictionary of American English © 2020
de•man•toid  (di mantoid),USA pronunciation n. [Mineral.]
  1. Mineralogya brilliant green variety of andradite garnet, used as a gem. Also called  Uralian emerald. 
  • Old French diamant) + -oid -oid
  • Middle High German diemant
  • German, equivalent. to (obsolete) Demant diamond (
  • 1890–95

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