-merism
noun combining form
tautomerism
noun combining form
 ETYMOLOGY  International Scientific Vocabulary, from Greek meros part — more at merit
: possession of (such) an arrangement of or relation among constituent chemical unitstautomerism
-mer·ism
\_məˌrizəm\  noun combining form 
(-s) 
Etymology: International Scientific Vocabulary -mer + -ism 
1. : possession of a (specified) association of substances in chemical compounds 
< isomerism >
< tautomerism >
2.[International Scientific Vocabulary mer- (III) + -ism]   : possession of (such or so many) parts 
1.
< isomerism >
< tautomerism >
2.