I"so- (?), Is- (?). [Gr. 'i`sos equal.]
A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic
. Specif.: (a) Chem.
Applied to certain compounds having the same composition but different properties; as in isocyanic
. (b) 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.
© Webster 1913.