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functional isomer

American  

noun

Chemistry.

  1. any of several structural isomers that have the same molecular formula but with the atoms connected in different ways and therefore falling into different functional groups.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.