Etymology
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Delian (adj.)

1620s, "of Delos," the tiny island in the Aegean that was the reputed birthplace of Apollo and Artemis. Delian problem "find the length of the side of a cube having double the volume of a given cube," was set by the oracle at Delos when it answered (430 B.C.E.) that the plague in Athens would end when Apollo's (cube-shaped) altar was doubled. The Latin fem. form of the word became the proper name Delia.

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