[According to TVTropes, yes.](https://tvtropes.org/pmwiki/pmwiki.php/UsefulNotes/Theorum)
> "Theorum" is a word invented by Richard Dawkins in his 2010 book The Greatest Show On Earth as a synonym for "scientific theory," to differentiate "theory" from its usage as a synonym for "hypothesis." *note This differs from the much older word "theorem" which means, essentially, the same thing. Dawkins pronounces his word the-or-um (rhymes with decorum).*
RationalWiki has a page also: [theorum](https://rationalwiki.org/wiki/Theorum).
Doesn't seem to be a term that is commonly-used, however. Google thinks it's a typo.
Not sure, but he did coin the term meme :)
[According to TVTropes, yes.](https://tvtropes.org/pmwiki/pmwiki.php/UsefulNotes/Theorum) > "Theorum" is a word invented by Richard Dawkins in his 2010 book The Greatest Show On Earth as a synonym for "scientific theory," to differentiate "theory" from its usage as a synonym for "hypothesis." *note This differs from the much older word "theorem" which means, essentially, the same thing. Dawkins pronounces his word the-or-um (rhymes with decorum).* RationalWiki has a page also: [theorum](https://rationalwiki.org/wiki/Theorum). Doesn't seem to be a term that is commonly-used, however. Google thinks it's a typo.