Today's Word "arcane"
Known by only a few
on
Published in Vocabulary
arcane \ahr-KEYN\ (adjective) - Known or understood by only a few.
"Lydia's knowledge of arcane economic principles occasionally pays off."
Latin arcanus "shut up, closed" hence "secret" from arca "a chest, box", as in Ark (Arc) of the Covenant. Unrelated to arcade, which derives from Latin arcus "arch".