nonessentialWiktionary 原文英美构词拆解nonnon-前缀essentialessential词干non-Used in the sense of no or none, to show lack of or failure to perform; or in the sense of not, to negate the meaning of the word to which it is prefixed.词源说明From non- + essential.释义形容词adjective1Not required; not essential.名词noun1Something that is not essential.同族词派生词 2nonessentiality·nonessential amino acid