One who drinks with another; a fellow drinker(noun)
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Use "compotator" in a sentence
"Dennison, who desires to be remembered to you, would be rejoiced to see his old compotator; but as I am now stationary, I expect regular answers to the epistles of"
"This amusement is superintended by the Friar, according to the recurrence of certain fustian words, to be repeated by every compotator in turn before he drank — a species of High Jinks, as it were, by which they regulated their potations, as toasts were given in latter times."
"On the present occasion, the revel had lasted since four oclock, and at length, under the direction of a venerable compotator who had shared the sports and festivity of three generations, the frolicsome company had begun to practise the ancient and now forgotten pastime of High Jinks."