any of three divisions of 10° within a sign of the zodiac.
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How to use decan in a sentence
A third of a sign, a "decan," was 10 degrees of longitude, corresponding to the "week" of ten days used in Egypt and in Greece.The Astronomy of the Bible | E. Walter Maunder
In this country, in the kingdom of Adel Khan, and in the decan, those diamonds are found which are called of the old water.
They bring it made into powder in tubes of cane; and it is worth a great deal in Narsinga, Malabar, and decan.A Description of the Coasts of East Africa and Malabar | Duarte Barbosa
These diamonds are gathered in the first India in a kingdom of Moors called decan, and they carry them thence to all parts.A Description of the Coasts of East Africa and Malabar | Duarte Barbosa
Thus there are at present four English renegadoes in the decan, besides many Portuguese.