"Isotactic" 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

"isotactic" Definition

  1. having or relating to a stereochemical regularity of structure in the repeating units of a polymer— compare ATACTIC

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