"Superstring" 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

"superstring" Definition

  1. a hypothetical string obeying the rules of supersymmetry whose vibrations manifest themselves as particles existing in ten dimensions of which only four are evident

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