• WordNet 3.6
    • n pisiform a small wrist bone that articulates only with the triquetral
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Webster's Revised Unabridged Dictionary
    • n Pisiform (Anat) A small bone on the ulnar side of the carpus in man and many mammals. See Illust. of Artiodactyla.
    • a Pisiform Resembling a pea or peas in size and shape; as, a pisiform iron ore.
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Century Dictionary and Cyclopedia
    • pisiform Having the form of a pea, as an ossification in tendons at joints; having a structure resembling peas. A variety of iron ore is called pisiform, from its being made up of small rounded masses about the size of a pea.
    • n pisiform In anatomy, a sesamoid bone, of about the size and shape of a pea, developed in the tendon of the flexor carpi ulnaris muscle of man and some other animals. It is generally reckoned as one of the carpal bones, making eight in all, in mau, but is not morphologically an element of the carpus. It is often of irregular shape, and sometimes one of the largest bones in the carpus, as in the horse. See also cuts under Artiodactyla, Perissodactyla, solidungulate, and hand.
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Chambers's Twentieth Century Dictionary
    • adj Pisiform pī′si-form pea-shaped.
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Webster's Revised Unabridged Dictionary
L. pisum, a pea + -form,: cf. F. pisiforme,
Chambers's Twentieth Century Dictionary
L. pisum, pea, forma, shape.


In literature:

P, The pisiform bone.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
In quadrupeds the palmar groove is especially determined by the pisiform bone, of which we have just mentioned the great development.
"Artistic Anatomy of Animals" by Édouard Cuyer