1) Carpal 2) Carpal bone 3) Os pisiforme 4) Pisiform bone 5) Wrist bone 
shaped like a pea
• (n.) A small bone on the ulnar side of the carpus in man and many mammals. See Illust. of Artiodactyla. • (a.) Resembling a pea or peas in size and shape; as, a pisiform iron ore.
(pi´sĭ-form) (piz´ĭ-form) resembling a pea in size and shape.
Pi'si·form adjective [ Latin pisum a pea + -form : confer French pisiforme .] Resembling a pea or peas in size and shape; as, a pisiform iron ore. Pi'si·form noun (Anat.) A small bone on the ulnar side of the carpus in man and many mammals. See Illust. of Artiodactyla . 
A bone in the wrist.
Pea-shaped; pea-like.
(bone) Type: Term Definitions: 1. a small bone the size and shape of a pea, in the proximal row of the carpus, lying on the anterior surface of the triquetral, with which it articulates; it gives insertion to the tendon of the flexor carpi ulnaris muscle. Realistically, it is considered a sesamoid bone within the continuous flexo...Type: Term Pronunciation: pis′i-fōrm Definitions: 1. Pea-shaped or pea-sized.
[n] - a small wrist bone that articulates only with the triquetral
pisum, pea.
pisiform bone noun a small wrist bone that articulates only with the triquetral
adjective, Latin pisum = a pea; hence, pea-shaped.