nulladj.
英 nʌl | 美 nʌl
中文adj. 无效的，无价值的；等于零的\nn. 零，[数] 空
无效的，无价值的；等于零的
n. 零，[数] 空
词根词源
null (adj.)"void of legal force," 1560s, from Middle French nul, from Latin nullus "not any, none," from ne- "not, no" (see un-) + illus "any," diminutive of unus "one" (see one).
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