microtoroidWiktionary 原文英美构词拆解micromicro-前缀toroidtoroid词干micro-(diminutive) Very small. · (metric units) One millionth.词源说明From micro- + toroid.释义名词noun1(physics) Any of an array of small ring-shaped structures, normally on the surface of a semiconductor substrate, that function as resonators in photonic devices.