Etymology
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isotonic (adj.)

"having or indicating equal tones," 1776, from Greek isotonos "of level pitch; equally stretched," from iso- "equal, identical" (see iso-) + tonos "tone," from PIE root *ten- "to stretch."

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Definitions of isotonic

isotonic (adj.)
(used of solutions) having the same or equal osmotic pressure;
Synonyms: isosmotic
isotonic (adj.)
relating to or characterized by the equal intervals of a musical scale;
isotonic tuning
isotonic (adj.)
of or involving muscular contraction in which tension is constant while length changes;
isotonic (adj.)
of two or more muscles; having equal tension;
From wordnet.princeton.edu