unrefined lead, cast in blocks called pigs

plural of zone plate

(astronomy) a type of supergiant spiral galaxy of the local universe that is much larger than most giant spiral galaxies, and whose stellar creation rate is much higher than typical spiral galaxies...

(US, law) A common law rule according to which a baseball team cannot be held liable for injuries suffered by a spectator struck by a foul ball so long as the team has offered some protected seating.