is-

Prefix

iso-

1. Same, identical.
   • iso- + effect → isoeffect

   Synonyms:

   ipsi-, homo-, syn-//sym-

   Antonyms:

   hetero-, allo-

2. Equal; equivalent.
   • iso- + rhythm → isorhythm

   Synonyms:

   equi-, pari-

   Antonyms:

   aniso-

3. Isomer.
   • iso- + methadone → isomethadone
4. Of an aliphatic compound, especially a fatty acid, having a branch on the penultimate carbon atom of a chain.
   • iso- + hexane → isohexane
5. Forms terms for specific kinds of isolines.
   • iso- + -therm → isotherm
6. Isomorphism.