Meaning

adjective (used of solutions) having the same or equal osmotic pressure

adjective relating to or characterized by the equal intervals of a musical scale

adjective of or involving muscular contraction in which tension is constant while length changes

originEtymology tree Ancient Greek ῐ̓́σος (ĭ́sos)lbor. English iso- Proto-Indo-European *ten- Proto-Indo-European *-os Proto-Indo-European *tónos Proto-Hellenic *tónos Ancient Greek τόνος (tónos) Proto-Indo-European *-kos Ancient Greek -κός (-kós) Ancient Greek -ικός (-ikós) Ancient Greek τονῐκός (tonĭkós) English tonic English isotonic From iso- + tonic.

Etymology from Wiktionary, CC BY-SA 3.0