The receptorome, is a concept analogue to the genome and proteome, but also to other sets of structural or functional units such as the proteasome and connectome.There is even, receptorome.org.
In analogy with the genome, where the genome is the total set of genes, the receptorome can be considered the total set of genes giving rise to receptors or receptor molecules. It could also be seen as the total number of receptor proteins in a certain organism.
I do not know the origins of the word. I do know, however, that it is a bit much. A key question for this and many other omics words is - is it needed? How much trouble would it be to say what we actually mean "all the receptors" or something like that. Recepterome gives too much formality to something that does not seem to be a concrete entity. Proteosomes - they are real things. Proteome - possibly annoying to some, but a straightforward concept independent of functional properties of proteins. Recepterome just is not a good analog of these terms.
And though at some level I do not want to thank them - I guess I should thank those who pointed this out to me: Bora in an email, mocost on twitter and PSI-Wavefunction in a comment. Thanks all - for for pointing out this new omics word ... so that I can give it today both by Bad Omics Word of the Day and Worst New Omics Word Award, even though it may not be so new. At some point I guess I should merge these awards. Then maybe I will call it the "Awardome.