Thanks everyone. It seems I always learn thirteen new facts when I ask about one thing. (no sarcasm, this is actually quite enlightening) I'm still curious why do most dictionaries-- even the most comprehensive ones I know, do not yield result for that. My theory is that lexicographers discount (some) grammatical words, and leave it for grammar-specific dictionaries or sources.

-Logwood (who's working out to become an English teacher one day...)