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The Collaborative International Dictionary
Isomer

Isomer \I"so*mer\ ([imac]"s[-o]*m[~e]r), n. [See Isomeric.] (Chem.) A compound which is isomeric with another body or compound; a compound having the same chemical composition as another compound; a member of an isomeric series.

Note: An isomer may be a structural isomer, in which some of the atoms are bonded to different atoms (as in CH3.CH2.NH2 and CH3.NH.CH3), or an optical isomer, in which the number and types of chemical bonds are identical, but the arrangement of the atoms in three-dimensional space is different; the latter are also called stereoisomers.

Douglas Harper's Etymology Dictionary
isomer

1866, back-formation from isomeric. Greek isomeres meant "sharing equality," from iso- (see iso-) + meros "part, share" (see merit (n.)).

Wiktionary
isomer

n. 1 (context chemistry English) Any of two or more compounds with the same molecular formula but with different structure. 2 (context physics English) Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.

WordNet
isomer

n. a compound that exists in forms having different arrangements of atoms but the same molecular weight

Wikipedia
Isomer

An isomer (; from Greek ἰσομερής, isomerès; isos = "equal", méros = "part") is a molecule with the same molecular formula as another molecule, but with a different chemical structure. That is, isomers contain the same number of atoms of each element, but have different arrangements of their atoms. Isomers do not necessarily share similar properties, unless they also have the same functional groups. There are two main forms of isomerism ( or ): structural isomerism (or constitutional isomerism) and stereoisomerism (or spatial isomerism).

Isomer (Proarticulata)

Isomer (Greek isos = "equal", méros = "part") is an element of transverse body articulation of the bilateral fossil animals of the Phylum Proarticulata from the Ediacaran (Vendian) period. This term has been proposed by Andrey Yu. Ivantsov, a Russian paleontologist from the Laboratory of the Precambrian organisms, Paleontological Institute, Russian Academy of Sciences.

Usage examples of "isomer".

There was only one distillery, in orbit, with the facilities to selectively flip the isomers that produced the fascinating, distinctive taste of smoke whiskey.

Teller had returned to his office the morning after the conversion of the MANN, had routinely checked his files for corruption, and had found only a small change in the spatial simulation of a particular isomer he'd been investigating for antitumor activity.

Featured here was a new and admired strain, which had in addition been grown in ultraviolet light, converting some of the inert cannabinoids into the 1 Delta isomer.

I programmed it as a comparator of optical isomers for a first step in trying to detect where and how our instincts are imprinted on us.

I programmed it as a comparator of optical isomers for a first step in trying to detect where and how our instincts are imprinted on us.

It may well be -- I have believed so ever since I was fourteen years old -- that the elements are all isomers, differentiated by geometrical structure, electrical charge, or otherwise in precisely the same way as ozone from oxygen, red from yellow phosphorous, dextrose from ~laevulose, and a paraffin from a benzene of identical empirical formula.