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Possible definitions for tetrads
tetra
Any of numerous attractively colored freshwater S. Amer. and African fishes (family Characidae), often kept in home aquariums. Tetras are small, lively, hardy, and unaggressive. The slender neon tetra (Paracheirodon, or Hyphessobrycon, innesi) has gleaming red hind parts and a neonlike blue-green stripe on its sides. The glowlight tetra (Hemigrammus erythrozonus) has a shining red stripe along each side. The body of the silver tetra (Ctenobrycon spilurus) is flattened sidewise.
tetrarch
(Greek: "ruler of a quarter") In Greco-Roman antiquity, the ruler of a principality, originally the ruler of one-quarter of a region or province. The first tetrarchs ruled the four tetrarchies of Thessaly under Philip II of Macedonia. Tetrarchs ruled in Galatia (in Asia Minor) before the Roman conquest (169 BC), and still later in Hellenized Syria and Palestine, where the title denoted the semi-independent ruler of a divided kingdom or minor district. Herod the Great's realm after his death (4 BC) was ruled by his three sons, two of whom were called tetrarchs.
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