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Definition of Theætetus
1. Proper noun. A classical Greek mathematician, living ''circa'' 417–369 B.C., credited with proving that there are precisely five regular convex polyhedra. ¹
2. Proper noun. A later middle dialogue of Plato concerning epistemology. ¹
3. Proper noun. A lunar impact crater 2·8 kilometres in depth and 25 kilometres in diameter, located southeast of the crater Cassini, near the eastern edge of Mare Imbrium, at coördinates 37·0° N, 6·0° E. ¹
¹ Source: wiktionary.com