| skeleton key | |
| —n | |
| Also called: passkey a key with the serrated edge filed down so that it can open numerous locks | |
| [C19: so called because it has been reduced to its essential parts] | |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a fool or simpleton; ninny. |