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Your larynx.

The part of the respiratory tract between the pharynx and the trachea, having walls of cartilage and muscle and containing the vocal cords enveloped in folds of mucous membrane.

The modified upper part of the respiratory passage of air-breathing vertebrates that is bounded above by the glottis, is continuous below with the trachea, has a complex cartilaginous or bony skeleton capable of limited motion through the action of associated muscles, and in humans, most other mammals, and a few lower forms has a set of elastic vocal cords that play a major role in sound production and speech called also voice box
Emcee: "You're all dirty toys with dirty socks and no choice but to suck. I'll battle all you nerdy boys and the bitches will flock, I'll crush you and your voice box."

Bystander: yo, my voicebox is sore from the concert. All that cheering and yelling.
by SpoR May 11, 2006
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the organ responsible for vocalization, the larnyx
Your voicebox can't be that sore from singing.
by The Return of Light Joker July 09, 2011
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