Is it ensure, insure, or assure?
ancient Greek vessel used for diluting wine with water. It usually stood on a tripod in the dining room, where wine was mixed. Kraters were made of metal or pottery and were often painted or elaborately ornamented. In Homer's Iliad the prize offered by Achilles for the footrace at Patroclus' funeral games was a silver krater of Sidonian workmanship. The Greek historian Herodotus describes many enormous and costly kraters dedicated at temples or used in religious ceremonies to hold libations.