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plural mers
(chemistry) A repeat unit: a structural unit which through repetition forms a polymer. quotations examples
A polymer is a compound formed of repeating structural units called mers, whose atoms share electrons to form very large molecules.
2010, Mikell P. Groover, Fundamentals of Modern Manufacturing (4th Edition), page 9
plural only
(fantasy) merpeople quotations examples
There are mermaids and mermen everywhere. They swim above us and linger in nooks and arched doorways. It's impossible not to stare. The mer are as diverse as humans—all ages, size, shape, and color.
2013, Missy Fleming, Into the Deep, page 65
(obsolete) Alternative form of mayor and mair.