1) Said to be a large bowl in which wine was mixed with water, although examples quoted in the OED date only from the early 1700s.
It was not uncommon much earlier: 1400 volo quod ille crater argenteus & una magna olla erea ... vendantur, York
1434 lego Johanni Staynerode ... unum craterem, Campsall
1441 unum craterem argenti planum et coopertum, Bulmer
1482 omnia vasa sua argenti, j cratere excepto, Harewood.