[???s?(?)'t?n?k]
¦ adjective
1. Physiology (of muscle action) taking place with normal contraction.
2. Physiology having the same osmotic pressure.
3. (of a drink) containing essential salts and minerals in the same concentration as in the body.
Derivatives
isotonically adverb
isotonicity noun
Origin
C19: from Gk isotonos, from isos 'equal' + tonos 'tone'.