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The Collaborative International Dictionary

Is-

Iso- \I"so-\, Is- \Is-\ [Gr. 'i`sos equal.] A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif.:

  1. (Chem.) Applied to certain compounds having the same composition but different properties; as in isocyanic.

  2. (Organic Chem.) Applied to compounds of certain isomeric series in whose structure one carbon atom, at least, is connected with three other carbon atoms; -- contrasted with neo- and normal; as in isoparaffine; isopentane.

Is-

Is- \Is-\ See Iso-.

Wiktionary

is-

pre. form of iso- before a vowel