A plural or Latin form relating to castoreum or beavers; in heraldry, beaver pelts or representations.
From Latin castor (beaver), plural castores. The word comes from Greek kastór, borrowed from a non-Indo-European source. This is primarily a scientific or heraldic term.
Castor fiber (the beaver) was so important to medieval heraldry that beaver pelts became symbols of wealth and trade—the Hudson's Bay Company literally built an empire on beaver fur!
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