What does Boxing Day have to do with boxing?
1811, from French hyoïde (16c.), from Modern Latin hyoides, from Greek hyoeides "shaped like the letter U," from hu "letter U" (in later Greek called upsilon) + -oeides "like" (see -oid).
subhyoid sub·hy·oid (sŭb-hī'oid')adj. Beneath the hyoid bone.
hyoid hy·oid (hī'oid')adj.
Shaped like the letter U.
Of or relating to the hyoid bone.