The pessulus is a delicate bar of cartilage connecting the dorsal and ventral extremities of the first pair of bronchial cartilages in the syrinx of birds. ... Found on http://en.wikipedia.org/wiki/Pessulus
• (n.) A delicate bar of cartilage connecting the dorsal and ventral extremities of the first pair of bronchial cartilages in the syrinx of birds. Found on http://thinkexist.com/dictionary/meaning/pessulus/
Pes'su·lus noun ; plural Pessuli . [ Latin , a bolt.] (Anat.) A delicate bar of cartilage connecting the dorsal and ventral extremities of the first pair of bronchial cartilages in the syrinx of birds. Found on http://www.encyclo.co.uk/webster/P/64