Usually means: Region between three tangent semicircles.
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We found 4 dictionaries that define the word arbelos:

General (2 matching dictionaries)
  1. arbelos: Wiktionary
  2. Arbelos: Wikipedia, the Free Encyclopedia

Science (2 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. Arbelos: Eric Weisstein's World of Mathematics

Definitions from Wiktionary (arbelos)

noun:  (geometry) A plane region bounded by a semicircle of diameter 1, connected to semicircles of diameters r and (1 − r), all oriented the same way and sharing a common baseline.

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