isotonic has 1 distinct synonym spread across 1 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 3 recorded opposites are hypertonic, hypotonic, isometric.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
(used of solutions) having the same or equal osmotic pressure
of or involving muscular contraction in which tension is constant while length changes
2 of the 4 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for isotonic.
Synonyms, antonyms and the broader and narrower relations for isotonic come from Princeton University’s WordNet. Full sources and licences.