Meaning

adjective (of living tissue) lacking normal tone or tension

adjective (of a solution) having a lower osmotic pressure than a comparison solution

originEtymology tree Proto-Indo-European *upó Ancient Greek ῠ̔πό (hŭpó) Ancient Greek ὑπο- (hupo-)der. English hypo- 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 hypotonic From hypo- +…

Etymology from Wiktionary, CC BY-SA 3.0