Zero-Lift Chord - A chord taken through the trailing edge of an airfoil in the direction of the relative wind when the airfoil is at
a zero-lift angle of attack.

Zero-Offset Steering - A steering system whose geometry has a scrub radius of zero.

Ziegler Process - A process for the low-pressure linear polymerization of ethylene and stereospecific polymerization of
propylene; the product is a high-derisity polymer or elastomer.

ZIGBEE - A standard for short-distance, low data rate communications

Zone Refining - A technique used to reduce the level of impurities in certain metals, alloys, semiconductors, and other

Zone valve - A device, usually placed near the heater or cooler, which controls the flow
of water or steam to parts of the building; it is controlled by a zone thermostat.

Zoning - a system of developing a city or county plan in which various geographic areas (zones) are restricted to certain uses
and development, such as industrial, light industrial, commercial, light-commercial, agricultural, single-family residential,
multi-unit residential, parks, schools and other purposes.
Engineering Glossary, Engineering Dictionary Z
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