Quondam (Latin).
Former. We say, He is a quondam schoolfellow—my former schoolfellow; my quondam friend, the quondam candidate, etc.; also the quondam chancellor, etc.
“My quondam barber, but ‘his lordshipʹ now.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.