I thought as I received notable words from Wordnik's Word of the Day service, I'd post them here. If you like, sign-up for Wordnik's Word of the Day service yourself. This one kind of goes along with my current series of online references. Part 4 will center on grammar.
A petty or pitiful grammarian; one who insists upon the minutest grammatical niceties.
The "caster" in this word comes from the Old Norse "kasta", to throw.