zeta n the sixth letter in the Greek alphabet (Ζ, ζ), a consonant, transliterated as z (from Greek, of Semitic origin; compare Hebrew sadhe)
n foll by the genitive case of a specified constellation the sixth brightest star in a constellation
n a torus-shaped apparatus used for research on controlled thermonuclear reactions and plasma physics
(C20: from z(ero-)e(nergy) t(hermonuclear) a(pparatus))
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"