noun. any of several small round bones formed in a tendon where it passes over a joint.
- sesamoid bone
- os sesamoideum
Example sentences of the word sesamoid
1. Noun, singular or mass
The underside of the foot near the base of the big toe typically has 2 sesamoid bones within tendons that flex the toe.
It is so called because of the sesamoid bones, which are tiny bones in the tendons of the big toe.