"Isarithm" 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

"isarithm" Definition

  1. a line drawn on a map or chart to connect points having equal numerical values (as of temperature, elevation, or density of population)

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