1760–70; < Neo-Latin pisiformis, equivalent to pisi- (combining form representing Latin pisum pea) + -formis -form

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World English Dictionary
pisiform (ˈpɪsɪˌfɔːm)
1.  zoology, botany resembling a pea
2.  a small pealike bone on the ulnar side of the carpus
[C18: via New Latin from Latin pīsum pea + forma shape]

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American Heritage
Medical Dictionary

pisiform pi·si·form (pī'sə-fôrm')
Resembling a pea in size or shape. n.
Pisiform bone.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
The fifth runs between the adjacent margins of the triangular and pisiform bones.
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