"Ustulation" validity in different word game dictionaries

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

"ustulation" Definition

  1. the action of burning or searing
  2. an operation formerly used in chemistry of expelling one substance from another (as sulfur from an ore) by heat in a muffle

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