castor

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(countable, uncountable) A hat made from the fur of the beaver.
(countable, uncountable) A heavy quality of broadcloth for overcoats.
(countable, uncountable) Castoreum (bitter exudate of mature beavers).
(countable, uncountable) Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia.

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Pronounced as (IPA)

/ˈkɑːs.tə/

From Middle French castor, from Old French castor (“beaver”), from Latin castor (“beaver”), from Ancient Greek κάστωρ (kástōr), from Doric Greek κάστον (káston, “wood”).