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Zethus
zetta-
zettabyte
zeugma
Zeus
Zhangjiakou
Zhejiang
Zhengzhou
zhlub
zho
Zhou
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zero-zero

ze·ro-ze·ro


adjective 
Definition:
 
making it impossible to see anything: describes flying conditions in which cloud is so thick and low that the pilot can see nothing ahead and nothing above or below the aircraft

[Shortening of zero ceiling, zero visibility]
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