Definition of: desmotropism

(des·mot′rə·piz′əm) noun Chem.
A form of tautomerism in organic compounds in which two molecules may have atoms of the same number, kind, and valence, and arranged in the same position, but with the shifting double bond permitting the independent existence of two types of the compound. [<Gk. desmos band + tropos turning]
—des·mo·trop·ic (des′mə·trop′ik, -trō′pik) adjective