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zirconium a chemical element that has forty protons in each nucleus and that is found principally in zircon, a crystalline silicate compound, but that can be isolated as a solid metal that is used extensively in nuclear reactors because it allows neutrons to pass through without significant resistance. (symbol: Zr)
zit (slang) a pimple.
zither a musical instrument that consists of a flat soundbox across which usu. thirty or forty strings are stretched, played by plucking the strings with the fingertips or a plectrum.
zloty the chief monetary unit of Poland, equaling one hundred groszy.
Zn symbol of the chemical element zinc.
-zoa used in the scientific names of certain zoological groups.
zodiac an imaginary belt in the heavens that includes the apparent paths of the sun, moon, and most planets and is divided into twelve equal signs or parts, each named for a constellation that appears within the belt as seen from the earth. [2 definitions]
zodiacal light a faint band of illumination along the ecliptic, often visible in the west just after sunset or in the east just before sunrise, that is thought to be caused by the reflection of sunlight from a cloud of particles around the sun.
-zoic of, relating to, or being a geological era characterized by (such) life. [2 definitions]
zombie a spell or supernatural force that, according to voodoo belief and legend, can enter a corpse, return life to it, and then control its actions. [5 definitions]
zonal of, pertaining to, or associated with a zone or zones. [2 definitions]
zone an area that is divided or distinct from other areas because of appearance, use, environment, or the like. [11 definitions]
zonk (slang) to become unconscious from drugs, exhaustion, or the like (usu. fol. by out). [3 definitions]
zoo a place, usu. a park, where living animals, esp. wild ones, are kept in enclosures for public viewing; zoological garden. [3 definitions]
zoo- animal.
zoogeography the study of the regional distribution of animal species and the causes and results thereof.
zoography the branch of zoology involved with the biological description of animals.
zooid any animal organism that can exist or move independently of the parent organism, esp. one produced by other than sexual means. [3 definitions]
zookeeper someone who takes care of animals in a zoo.
zoological of or concerning zoology. [2 definitions]
zoological garden a public park or other enclosed area in which live animals are kept for exhibition; zoo.