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sesamoid Line breaks: ses¦am|oid
Pronunciation: /ˈsɛsəmɔɪd/
(also sesamoid bone)

Definition of sesamoid in English:


A small independent bone or bony nodule developed in a tendon where it passes over an angular structure, typically in the hands and feet. The kneecap is a particularly large sesamoid bone.
Example sentences
  • Plain radiographs may reveal the type of injury by the position of the sesamoids.
  • A sesamoid bone may develop in the bicipital tendon over the radial tuberosity.
  • The patella is the largest sesamoid bone in the body and provides increased mechanical advantage for knee extension.


Late 17th century: from sesame (with reference to the similarity in shape of a sesame seed) + -oid.

Definition of sesamoid in:
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