Is-

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Is-

1. (Science: prefix) a prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif.

2. (Science: chemistry) 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.

Origin: gr. 'isos equal.