iso-

i·so-
UK/aɪsə-/UK/aɪsəʊ-/UK/aɪˈsɒ-/US/aɪsoʊ-/

prefix

Same, identical.

“iso- + effect → isoeffect”

Similar
ipsi-homo-syn-//sym-equi-pari-
Opposite
hetero-allo-aniso-
OriginAncient Greek ἴσος →
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Meanings

prefix

alternative before vowel is-

  1. Same, identical.

    iso- + effect → isoeffect

    1 more example

    iso- + intense → isointense

    Synonyms: ipsi-, homo-, syn-//sym- · Antonyms: hetero-, allo-

  2. Equal; equivalent.

    iso- + rhythm → isorhythm

    Synonyms: equi-, pari- · Antonyms: aniso-

  3. chemistryIsomer.

    iso- + methadone → isomethadone

  4. chemistryOf an aliphatic compound, especially a fatty acid, having a branch on the penultimate carbon atom of a chain.

    iso- + hexane → isohexane

  5. climatologyForms terms for specific kinds of isolines.

    iso- + -therm → isotherm

    1 more example

    iso- + -chrone → isochrone

  6. mathematicsIsomorphism.

Synonyms & antonyms

prefixSame, identical.

Similar
ipsi-homo-syn-//sym-
Opposite
hetero-allo-

prefixEqual; equivalent.

Similar
equi-pari-
Opposite
aniso-
Also see
equi-homo-syn-

Origin

  1. Ancient Greekἴσος“equal”
  2. Englishiso-

Internationalism. Learned borrowing from Ancient Greek ἴσος (ísos, “equal”).

More words from Ancient Greek

Full word history & related roots →

Translations

Finnish iso-
  • iso-equal
French iso-
  • iso-equal
Greek ισο-
  • ισο- (iso-)equal
Irish isi-
  • isi-equal
Italian iso-
  • iso-equal
Polish izo-
  • izo-equal
Portuguese iso-
  • iso-equal
Russian изо-
  • изо- (izo-)equal
Spanish iso-
  • iso-equal
Cite this entry
APA

iso-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/iso-

MLA

“iso-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/iso-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “iso-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/iso-.

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