Is the hyoid a sesamoid bone?

No, the hyoid bone is not classified as a sesamoid bone. It is an independent, U-shaped bone located in the neck, which supports the tongue and is involved in swallowing. Sesamoid bones, such as the patella, are typically embedded within tendons and help to protect them and improve leverage. The hyoid does not fit this definition, as it is not embedded in a tendon.