"Subcritical" 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) Yes

"subcritical" Definition

  1. less or lower than critical in respect to a specified factor
  2. of insufficient size to sustain a chain reaction
  3. designed for use with fissionable material of subcritical mass

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