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tetrad (n.)
"the number four, collection of four things," 1650s, from Greek tetras (combining form tetrad-) "group of four, number four" (from PIE root *kwetwer- "four").
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Definitions of tetrad
Dictionary entries near tetrad
tetherball
Tethys
Teton
tetra-
tetracycline
tetrad
tetragrammaton
tetrahedron
tetralogy
tetrameter
tetrapod