Keen

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Keen

(kēn),
William W., U.S. surgeon, 1837-1932. See: Keen operation.
References in periodicals archive ?
Lee Woodyatt and Ryan Sugden are as keen as mustard to get into the action, so that gives me options,'' said Wright.
I've been riding out at Ballydoyle all week but I'm used to having eight rides a day, so I'm as keen as mustard to get out there.
He's still as keen as mustard and needs just three more League games to make 1,000, which is his driving ambition.