Definition of "ad-libber" [ad-libber]

• A person who ad-libs, particularly one who is well-known for skill in ad-libbing (noun)

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• "The vaudeville star Eddie Cantor called Linkletter the best ad-libber in radio."
• "For a would-be NFL lineman who never made it to the league after injuring his knee in tryouts, Madden might be the NFL's most successful ad-libber."
• "He's a brilliant ad-libber -- he spent his early years doing improv theater -- with an encyclopedic mind."