ai­heut­taa ­häi­ri­ö

1. cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull; "The orbits of these stars were perturbed by the passings of a comet"
2. disturb or interfere with the usual path of an electron or atom; "The electrons were perturbed by the passing ion"

Hierarkia