: a bone on the ulnar side of the carpus in most mammals
Examples of pisiform in a Sentence
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Scott Travers, Forbes.com, 3 May 2026
The Angels catcher fractured his pisiform bone when a foul ball in Saturday’s game struck the tiny bone near his wrist on the pinky side of his left hand.
—Jeff Fletcher, Oc Register, 26 Apr. 2026
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Noun
Ossification begins with the capitate and hamate during the first year of life, proceeds through the triquetrum, lunate, scaphoid, trapezium and trapezoid through middle childhood, and is not completed until the pisiform ossifies between ages 9 and 12.
—Scott Travers, Forbes.com, 3 May 2026
The Angels catcher fractured his pisiform bone when a foul ball in Saturday’s game struck the tiny bone near his wrist on the pinky side of his left hand.
—Jeff Fletcher, Oc Register, 26 Apr. 2026
Cite this Entry
“Pisiform.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pisiform. Accessed 2 Jun. 2026.
Copy CitationMedical Definition
pisiform
1 of 2 adjective
pi·si·form
ˈpī-sə-ˌfȯrm 
: resembling a pea in size or shape
pisiform granules
pisiform
2 of 2 noun
variants
or pisiform bone
: a bone on the little-finger side of the carpus that articulates with the triquetral bone
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