Definition of sesamoid in English:


Syllabification: ses·a·moid
Pronunciation: /ˈsesəˌmoid
(also sesamoid bone)


  • 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.
    More 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.

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