JAR  , a

vessel of simple form, made of earthenware, glass, &c., with a spoutless mouth, and usually without handles . The word came into English through Fr. jarre or Span. jarra, from Arab. jarrah, the earthenware vessel of Eastern countries, used to contain water, oil, wine, &c . The simple electrical condenser known as a Leyden Jar (q.v.) was so called because of the early experiments made in the science of electricity at Leiden . In the sense of a harsh vibrating sound, a sudden shock or vibrating movement, hence dissension, quarrel or petty strife, " jar " is onomatopoeic in origin; it is also seen in the name of the bird night-jar (also known as the goat-sucker) . In the' expression " on the jar " or " ajar," of a door or window partly open, the word is another form of chore or char, meaning turn or turning, which survives in charwoman, one who works at a turn, a job and chore, a job, spell of work .