A cartilaginous structure at the top of the trachea; contains elastic vocal cords that are the source of the vocal tone in speech WordNet 3.0 & Open English WordNet

The larynx, commonly called the voice box, is an organ in the top of the neck involved in breathing, producing sound and protecting the trachea against food aspiration. Wikipedia

Colloquially known as the voice box, an organ in the neck of land vertebrates involved in protection of the trachea and sound production and vibration of the larynx Wikipedia Disambiguation

Voice box, an organ in the neck of amphibians, reptiles, and mammals Wikidata

An organ of the neck of mammals situated just below where the tract of the pharynx splits into the trachea and the oesophagus (or esophagus). It is involved in breath control and protection of the trachea, and, because it houses the vocal cords, sound production. Wiktionary

Organ involved in breath control, protection of the trachea, and sound production. Wiktionary (translation)