"Zeitgeber" 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

"zeitgeber" Definition

  1. an environmental agent or event (such as the occurrence of light or dark) that provides the stimulus setting or resetting a biological clock of an organism

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