Stapes

анатомия стремя, стремечко (pl без измен., тж. stapedes)

Англо-русский научно-технический словарь

Stapes

noun (plural stapes or stapedes) Etymology: New Latin staped-, stapes, from Medieval Latin, stirrup, alteration of Late Latin stapia the innermost ossicle of the middle ear of mammals — called also stirrup — see ear illustration

Merriam-Webster's Collegiate Dictionary