"Semidiurnal" 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

"semidiurnal" Definition

  1. relating to or accomplished in half a day
  2. occurring twice a day
  3. occurring approximately every half day

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