1936 W. O. Carothers in Trans. Faraday Soc. 32 49 Assume that the weight of the mer or unit is 100.

1952 Jrnl. Polymer Sci. 8 258 The slight variability in composition and chemical structure permitted..for high polymers results from the presence of end groups, occasional branches, variation in orientation of the mers (monomeric units), irregularity in the sequence of different types of mers (in copolymers), and sometimes other irregularities.

1967 D. Margerison & G. C. East Introd. Polymer Chem. i. 3 As soon as more than one mer is involved, a wide diversity of polymer structure and type becomes possible.

1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) ix. 202 Polymerization by addition, where a number of basic units (monomers) are added together to form a large molecule (polymer) in which there is a repeated unit (mer).