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| There are 6 entries in the glossary. |
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| Zebra Mussel | A small freshwater mollusk that was accidentally introduced to North American waters via ballast water from a transoceanic vessel. The zebra mussel has had significant negative economic and ecological effects: It clogs water intake pipes and attaches to and fouls boat hulls, dock pilings and other objects. |
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| Zenith | The point of the celestial sphere which is directly overhead. |
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| Zenith Angle | The angle between the zenith and a heavenly body. |
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| Zephyr | A gentle breeze; the slightest movement of air. |
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| Zincs | Sacrificial anodes placed on a vessel to prevent electrolysis of vital metal parts. |
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| Zulu | Used to indicated times measured in Coordinated Universal Time, a successor to Greenwich Mean Time. A time standard that is not affected by time zones or seasons. |
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