Zester is a French word which means "to zest or remove the colored part of the citrus fruit skin, a zitrus that is usually zest is that of lemon and orange.

Zester is pronounced as "zes tay"

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Other definition:
Zester refers to a hand held tool or handy gadget that removes or quickly and easily separates zest from citrus fruit. It has a metal rectangular head with several holes in it, the holes are passed over the skin of the fruit and fine shavings of the zest are removed, as in remove the zest from the lemon or orange using a zester