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Isotopes are atoms of the same element which have differing number of neutrons.

This means they have the same number of protons.
Deuterium is an isotope of hydrogen.
Deuterium is hydrogen-2, i.e. hydrogen with a mass number of 2 (1 proton + 1 neutron).

Tritium is a rarer isotope of hydrogen, and is also known as hydrogen-3 (it has 1 proton + 2 neutrons).
Isotope by ChemMan May 12, 2010
Related Words
Lighter and heavier versions of the same thing, (but usually in reference to atoms)
Bud and Bud Lite are "isotopes" of Bud. When you gain weight, you just become an "isotope" of your former self.
isotope by 387mqr October 9, 2008
The "auxiliary" verger of Cloisterham Cathedral.
IsoTope may indeed have had just a minor role in the "Mystery Of Edwin Drood" tale, but I am still a bit surprised that neither Dickens nor Garfield made any mention of him in the famous mystery-thriller story.
IsoTope by QuacksO November 14, 2018

Isotoners 

A outdoor rubber glove, used for gardening and yard work. The brand of gloves OJ couldn't fit on his hands during his murder trial.
Joe: I'm thinking of getting these isotoners to do some yard work

Bob: Good idea, plus if you kill someone and they get wet they'll shrink and you'll be acquitted.
Isotoners by Randyt13 June 22, 2013

Isotoners 

Gloves, referencing to the ones in the OJ murders.
OJ wore isotoners when he killed a bitch.
Isotoners by Zach=BAMF October 23, 2007
equally cool or just as cool
i love isodope clothes
ISOdope by scykosiz April 23, 2005