Z, z

zebra. Brit. Parallel white lines on a road indicating that oncoming traffic must yield to pedestrians.
zenith. The highest point.
zephyr. A gentle breeze.
zeppelin. 1. A blimp (qv). 2. One of a now obsolete class of lighter-than-air passenger airships.
zero-zero. Used to describe weather conditions of no ceiling (qv) and no visibility.
zip code. A five- or nine-digit number used to facilitate the delivery of mail. "Zip" is an acronym for zone improvement plan.
Zodiac. A brand of motorized, rigid-bottom, inflatable boat often used for recreational outings and wet landings from cruise ships.
zoning. Municipal laws or regulations regulating the type and size of buildings that can be erected and activities undertaken in specific areas.
zoo, zoological park. A park displaying wild (as opposed to domesticated) animals.
ZP. CRS. Flight segment tax.