(Canada, US) A glass jar with a screw top, often used for preserving food.

(US, dated) A container used for urinating or defecating when it is not possible or convenient to use a bathroom or toilet; a bedpan, a chamber pot. Commonly used in hospitals, where it is normally called bedpan. Formerly used in private residences that were without an indoor toilet or bathroom.

A container for holding papers, each bearing the name of a task to be completed, serving a similar purpose to a to-do list.

plural of night-jar

Alternative spelling of nightjar.

A small ball mill with a jar-like drum.

plural of jar mill

plural of cupping-jar

Alternative spelling of cupping jar

A small insulated Leyden jar, placed between an electrical machine and a larger jar or battery, so as to announce, by its repeated discharges, the amount of electricity passed into the larger jar.