Scrabble Dictionary

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Yes, isotonic is playable

...and is worth 12 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Isotonic" Definition

adjective

Having the same concentration of solutes as the blood: an isotonic saline solution.
Isosmotic.
Of equal tension.
Physiology Of or involving muscular contraction in which the muscle remains under relatively constant tension while its length changes.
Of, relating to, or being muscular contraction in the absence of significant resistance, with marked shortening of muscle fibers, and without great increase in muscle tone.

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