Hypertext Webster Gateway: "isomer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Isomer \I"so*mer\, n. [See {Isomeric}.] (Chem.)
A body or compound which is isomeric with another body or
compound; a member of an isomeric series.
From WordNet (r) 1.7 (wn)
isomer
n : a compound that exists in forms having different
arrangements of atoms but the same molecular weight
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