"Prefixation" validity in different word game dictionaries

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

"prefixation" Definition

  1. formation or inflection by means of prefixes
  2. development or treatment prior to photographic fixation

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