epicadmiumWiktionary 原文英美构词拆解epiepi-前缀cadmiumcadmium词干epi-Above in location or position. · Upon, atop, directly on top of in terms of position.词源说明From epi- + cadmium.释义名词noun1(physics) Used attributively to describe kinetic energies above that at which cadmium has a large neutron cross section