The thirteenth one of any number of things; specifically, in whist, the last card of a suit left in the hands of a player after the other twelve have been played.(noun)
The Century Dictionary (Public Domain)
Use "thirteener" in a sentence
"And when, at the last, holding only a thirteener and a fork in Clubs, he led the losing card of the latter, she could endure the agony no longer."
"Said McHale of The Sphere, who, having been stuck with the queen of spades -- that most unlucky thirteener -- twice in succession, was retiring on his losses, to Mallory of The Ledger who had just come in:"
"I was a thirteener, and must, whether or no, go over to the next column, like the odd figure you carry along when you do a sum in addition."