1. (a.) Wedge-shaped; as, a cuneiform bone; -- especially applied to the wedge-shaped or arrowheaded characters of ancient Persian and Assyrian inscriptions. See Arrowheaded.

2. (a.) Pertaining to, or versed in, the ancient wedge-shaped characters, or the inscriptions in them.

3. (n.) The wedge-shaped characters used in ancient Persian and Assyrian inscriptions.

4. (n.) One of the three tarsal bones supporting the first, second third metatarsals. They are usually designated as external, middle, and internal, or ectocuniform, mesocuniform, and entocuniform, respectively.

5. (n.) One of the carpal bones usually articulating with the ulna; -- called also pyramidal and ulnare.