So I googled 'dimer meaning':
dimer. (dī'mər) Any of various chemical compounds made of two smaller identical or similar molecules (called monomers) that are linked together. Dimers are linked by hydrogen bonds, coordinate bonds, or covalent bonds. Sucrose is a dimer composed of the monomers glucose and fructose.
I suspect someone was trying to make themselves sound clever. It's well known that GH is made up of long chains of amino acids. Saying that one GH has more 'dimers' than another is silly. GH is GH