Definition of pisiform in US English:

pisiform

(also pisiform bone)

noun

  • A small rounded carpal bone situated where the palm of the hand meets the outer edge of the wrist.

    • ‘The flexor carpi ulnaris inserts on the pisiform.’
    • ‘The slip is sometimes joined or replaced by a muscular fasciculus arising from, or in the neighborhood of, the pisiform bone.’
    • ‘The motor branch to the hypothenar muscles separates from the main ulnar nerve just distal to the pisiform at the wrist.’
    • ‘The nerve recombined also beyond the tendon and was subject to compression, proximal to the pisiform bone.’
    • ‘Passing through the cubital region, it descends to the pisiform region proximal to the palm and enters the palm.’

Origin

Mid 18th century: from modern Latin pisiformis ‘pea-shaped’, from pisum ‘pea’ + forma ‘shape’.

Pronunciation