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When several things that are successive go in a series, they are called a homologous series i.e. In Chemistry, there is the homologous series of hydrocarbons e.g. alkanes.

I am trying to state that butane is next in the homologous series for alkanes, so it comes up something like this:

"Butane is the next __ in the series."

What is the word that would fit in the blank?

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    Alkane, obviously. (^_^) – RegDwigнt May 28 '11 at 8:55
  • Hahaha! I was thinking of that when I was writing it, but that wasn't the word I was looking for. – Thursagen May 28 '11 at 10:18
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You almost had it!

homologue (also homolog); noun, technical
a homologous thing.

A search for “next homologue of” on Google links to chemistry test questions and scientific articles, showing that it's the right technical term. Also, I'm a chemist, and that's the term I use.

  • Do you have a word for any other series? – Thursagen May 28 '11 at 10:18
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"Butane is the next member of the series."

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You do not need another word, e.g. "Butane is the next in the series."

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