isotonic

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/ˌɑɪ.səˈtɑː.nɪk/

adjective

Having the same osmotic pressure.

“Use an isotonic saline solution in your neti pot to prevent irritation of your nasal passages.”

Similar
isosmotictense
Opposite
hypertonichypotonicisometric
OriginEnglish tonic ← Ancient Greek τονῐκός (tonĭkós) ← Proto-Hellenic *tónos →
UncommonScrabble 10
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Meanings

adjectiveisotonic (not comparable)
  1. not comparableHaving the same osmotic pressure.
  2. not comparableHaving the same concentration of solutes as human blood.

    Use an isotonic saline solution in your neti pot to prevent irritation of your nasal passages.

  3. not comparableHaving equal tension.
  4. not comparablemedicineOf or involving muscular contraction against resistance in which the length of the muscle changes. Antonym is isometric. Isotonic movements are either concentric (working muscle shortens) or eccentric (working muscle lengthens). See also Wikipedia:Isotonic (exercise physiology)
  5. not comparableentertainmentHaving the same tone.

Synonyms & antonyms

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

Similar
isosmotic
Opposite
hypertonichypotonic

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

Opposite
isometric

adjectiveof two or more muscles; having equal tension

Similar
tense
Also see
isosmotic

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Ancient Greekῐ̓́σος (ĭ́sos)
  2. Englishiso-
  3. Proto-Indo-European*ten-
  4. Proto-Indo-European*tónos
  5. Proto-Hellenic*tónos
  6. Ancient Greekτόνος (tónos)
  7. Ancient Greekτονῐκός (tonĭkós)
  8. Englishtonic
  9. Englishisotonic

From iso- + tonic.

Full word history & related roots →

Translations

Catalan isotònic
  • isotònichaving the same osmotic pressure
Chinese Mandarin 等渗
  • 等渗 (děngshèn)having the same osmotic pressure
Czech izotonický, isotonický
  • izotonickýhaving the same osmotic pressure
  • isotonickýhaving the same osmotic pressure
Finnish isotoninen
  • isotoninenhaving the same osmotic pressure
French isotonique
  • isotoniquehaving the same osmotic pressure
German isotonisch
  • isotonischhaving the same osmotic pressure
Hungarian izotóniás
  • izotóniáshaving the same osmotic pressure
Italian isotonico
  • isotonicohaving the same osmotic pressure
Polish izotoniczny
  • izotonicznyhaving the same osmotic pressure
Portuguese isotónico, isotônico
  • isotónicohaving the same osmotic pressure
  • isotônicohaving the same osmotic pressure
Russian изотони́ческий
  • изотони́ческий (izotoníčeskij)having the same osmotic pressure
Spanish isotónico
  • isotónicohaving the same osmotic pressure
Turkish izotonik
  • izotonikhaving the same osmotic pressure

Rhymes & wordplay

Anagrams

isotocin
Cite this entry
APA

isotonic. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/isotonic

MLA

“isotonic.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/isotonic. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “isotonic,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/isotonic.

Source: isotonic on Wiktionary, CC BY-SA 4.0.