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Used other than with a figurative or idiomatic meaning: see zero,‎ day.

Average residues of 1.44 and 2.18 mg/kg chlortetracycline were seen in liver and kidney, respectively, at zero-day withdrawal.

Additional definitions for 'zero-day':

zero-daynewly discovered, and therefore still not fixed and possibly exploited by hackers or other criminals
zero-daybenefiting from newly found and yet unpatched or unmitigated flaw in software or hardware; using zero-day vulnerability
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"zero-day." STANDS4 LLC, 2019. Web. 19 Jan. 2019. <>.

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