What is Ambidexter?

Legal Definition
It is intended by this Latin word, to designate one who plays on both sides; in a legal sense it is taken for a juror or embraceor who takes money from the parties for giving his verdict. This is seldom or never done in the United States.
-- Bouviers Law Dictionary
Legal Definition
Skillfui with both hands; one who plays on both sides. Applied anciently to an attorney who took pay from both sides, and subsequently to a juror guilty of the same offence. Cowell.
-- Black's Law Dictionary
Legal Definition
An attorney who received pay from both sides; a bribed juror.
-- Ballentine's Law Dictionary