WordReference Random House Unabridged Dictionary of American English © 2020
troost•ite  (tro̅o̅stīt),USA pronunciation n. 
  1. Metallurgya microconstituent of hardened and tempered steel, consisting of a very fine aggregate of ferrite and cementite.
troost•it•ic  (tro̅o̅stīt),USA pronunciation adj. 
  • see -ite1 1900–05; named after Latin. J. Troost (died 1911), French chemist

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