"Troostite" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) No

"troostite" Definition

  1. a variety of willemite occurring in large reddish crystals in which the zinc is partly replaced by manganese
  2. slightly tempered martensite that etches dark and cannot be resolved by the optical microscope

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