Example Sentences

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Of nouns in on, derived from Greek, the greater part always form the plural regularly; as, etymons, gnomons, ichneumons, myrmidons, phlegmons, trigons, tetragons, pentagons, hexagons, heptagons, octagons, enneagons, decagons, hendecagons, dodecagons, polygons.

From The Grammar of English Grammars by Brown, Goold

A. Because it has ten sides and ten angles, and there are both regular and irregular decagons.

From The Infant System For Developing the Intellectual and Moral Powers of all Children, from One to Seven years of Age by Wilderspin, Samuel