"Cidaris" validity in different word game dictionaries

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

"cidaris" Definition

  1. [Latin, from Greek kidaris, probably of Semitic origin; akin to Hebrew kether crown]: the royal tiara of the ancient Persian kings
  2. [New Latin, from Latin]: the type genus of Cidaridae

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