I. |thīrō+ adjective
also thy·ro·hyoidean “+
Etymology: thyr- + hyoid or hyoid + -an, adjective suffix
1.
a. : connecting the thyroid cartilage of the larynx and the hyoid bone
b. : of, relating to, or associated with the thyrohyoid muscle
2. : of, relating to, or being the first branchial arch of the vertebrate embryo
II. noun
: a thyrohyoid part (as a muscle or a nerve)