Axis - axon, axle or pivot.⏎
Azygos - azygos, unyoked (not a pair) named for its asymmetry.⏎
Aponeurosis - apo, from: neuron, tendon. (Early GREEK anatomists used neuron indiscriminately for nerves and tendons.)⏎
Cruciate - crux (crucis), a cross.⏎
Ampulla - ampulla, flask.⏎