ETYMOLOGY
from obsolete French vainquissant, present participle of vainquir, a rare variant of vaincre (to conquer, overcome)
EXAMPLE
“… Full glad was Eromena to heare of such things, acknowledging her thankes to heaven for doing them in the favour of her girle. Congratulations she received not as a woman in child-bed, but as a Captaine vanquissant of a battel. Many times and often kissed shee her sweet babe, who without either crying or weeping, beheld stedfastly the faire light of the world; by no meanes possible would the sweet little one endure the swathing bands, but would with a lovely fiercenesse push them off her. …”
From: Eromena, or, Love and Revenge
Written originally in the Thoscan tongue, by Cavalier Giovanni Francesco Biondi
Translated by James Hayward, 1632
Lexicophilia 