Hypertext Webster Gateway: "Metamer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Metamer \Met"a*mer\, n. [See {Metamere}.] (Chem.)
Any one of several metameric forms of the same substance, or
of different substances having the same composition; as,
xylene has three metamers, viz., orthoxylene, metaxylene, and
paraxylene.
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