arbelos

== English == === Etymology === From Ancient Greek ἄρβηλος (árbēlos) or ἄρβυλος (árbulos), literally "shoemaker's knife". === Pronunciation === === Noun === arbelos (plural arbeloses) (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. === Anagrams === Rabelos, Rosabel, balsero, labrose, solebar