/ ˈaɪvəri; NAmE / ( pl. -ies ) noun
1.
[ U ] a hard yellowish-white substance like bone that forms the tusks (= long teeth) of elephants and some other animals :
a ban on the ivory trade
an ivory chess set
2.
[ C ] an object made of ivory
3.
[ U ] a yellowish-white colour
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WORD ORIGIN
Middle English : from Anglo-Norman French ivurie , based on Latin ebur .