Acetabulum - acteum, vinegar + abrum, holder. Small cup for vinegar, hence any small cup.⏎
Circumflex - circum, around; flexere, to bend.⏎
Ansa - ansa, handle.⏎
Azygos - azygos, unyoked (not a pair) named for its asymmetry.⏎
Ampulla - ampulla, flask.⏎