meganucleaseWiktionary 原文英美构词拆解megamega-前缀nucleasenuclease词干mega-(originally) Very large, great. · In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106).词源说明From mega- + nuclease.释义名词noun1An endonuclease that binds to a specific long nucleotide sequence when cleaving.