The upper part of a pin-tumbler lock, containing the driver pins and springs.
Omasum, the third compartment of the stomach of ruminants
Synonym of holystone: a piece of sandstone used for scouring wooden decks on ships.
A comprehensive manual that describes something, or a publication with a loyal readership.
A compilation of problems and solutions from previous years of a given course, used by some students to cheat on tests or assignments.