jar 1 
(jär)
(jär)n.
1. A cylindrical glass or earthenware vessel with a wide mouth and usually no handles.
2. The amount that a jar can hold.
3. Chiefly British A glass of beer.
tr.v. jarred, jar·ring, jars
To put into a jar.
[Middle English jarre, a liquid measure, from Old French (from Provençal jarra) and from Medieval Latin jarra, both from Arabic jarra, earthen jar, from jarra, to draw, pull; see grr in the Appendix of Semitic roots.]
jarful′ n.