Being sick is not generally reckoned to be a sign of intelligence (though the novelist in me is immediately wondering when it might be, and I've come up with three possibilities: the that-mushroom's-other-name-is-the-Angel-of-Death scenario; the Science-Fiction dinner party my-digestive-system-requires-that-everything-goes-through-twice idea; and the I've-somehow-ended-up-being-drunkenly-propositioned-by-the-wife-of-the-Mafia-boss thing).
Still, silicic (yes, the first c does have an s sound, though sadly most people stress the second i) just means to do with silicon.
I suppose, really, if we were tracking down blame for this ridiculous word, we'd have to point the finger at the person who named silicon, wouldn't we.
Word Not To Use Today: silicic. Silicic is named after silicon, which was discovered and named by Jöns Jakob Berzelius, from the Latin word for flint, silex, on the model of boron and carbon (flint is basically silicon oxide). Of course, being Swedish, Berzelius wouldn't have realised how unfortunate a word silicon actually is - and presumably his mate Humphry Davy didn't like to tell him.