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iso-

  1. a combining form meaning “equal,” used in the formation of compound words: isochromatic; in chemistry, used in the names of substances which are isomeric with the substance denoted by the base word: isocyanic acid.

combining form

  1. equal or identicalisomagnetic
  2. indicating that a chemical compound is an isomer of a specified compoundisobutane; isocyanic acid

word-forming element meaning “equal, similar, identical; isometric,” from comb. form of Greek isos “equal to, the same as” (e.g. isometor “like one’s mother”). Used properly only with words of Greek origin; the Latin equivalent is equi- (see equi-).

pref.

  1. Equal; uniform:isobar.
  2. Isomeric:isopropyl.
  3. Characterized by sameness with respect to species:isoantigen.
  4. Characterized by sameness with respect to genotype:isograft.

  1. A prefix that means “equal,” as in isometric, “having equal measurements.”
  2. A prefix used to indicate an isomer of an organic compound, especially a branched isomer of a compound that normally consists of a straight chain. The isomer is characterized by a Y-shaped branch at the end of the chain that consists of two “prongs”. Each prong consists of one carbon atom. Thus isopentane contains five carbon atoms like normal pentane, but arranged as a chain of three carbons plus a Y-shaped branch of two carbons at the end.

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