isomeriden.

1857 W. A. Miller Elements Chem. III. i. 5 The formation of isomerides, metamerides, and polymerides, as bodies which possess the same percentage composition may be termed, can only be accounted for by supposing that differences of chemical arrangement occur in these different cases.

1892 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) III. 85/2 The hypothesis serves therefore at once to explain..the existence of isomerides which cannot be represented by formulae written in a single plane.