n. pl. Syringes. (Mus.) A wind instrument made of reeds tied together; - called also pandean pipes. (Anat.) The lower larynx in birds. In birds there are two laringes, an upper or true, but voiceless, larynx in the usual position behind the tongue, and a lower one, at or near the junction of the trachea and bronchi, which is the true organ of the voice.