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| the figure of the moon in its first or last quarter, resembling a segment of a ring tapering to points at the ends |
| the polestar or North Star, a star of the second magnitude close to the north pole of the heavens, in the constellation Ursa Minor |
| eon (ˈiːən, ˈiːɒn) | |
| —n | |
| 1. | the usual US spelling of aeon |
| 2. | geology the longest division of geological time, comprising two or more eras |
| eon (ē'ŏn') Pronunciation Key
The longest division of geologic time, containing two or more eras. |