• (n.) A median process on the furculum, or merrythought, of many birds, where it is connected with the sternum.
Hy`po·clei'di·um noun ; plural Latin Hypocleida , English Hypocleidiums . [ New Latin , from Greek ... under + ... a little key.] (Anat.) A median process on the furculum, or merrythought, of many birds, where it is connected with the sternum.