isomerism

(i-som’er-izm) (Gr. toos equal + μέρος part]. The act or quality of being isomeric. nucleus i., isomerism between bodies which appear to differ only in the mode of connection of their carbon nuclei. physical i., the isomerism of bodies which are chemically identical but physically different. place-i., isomerism in which two or more chemically isomeric bodies appear to differ only in the arrangement of the atoms attached to their nuclei. stereo chemic i., isomerism in which the atoms are the same and are connected in the same way, but are arranged differently in the molecule. {somerous (i-som’er-us). Isomeric.