From Latin eburnus.
eburnine (comparative more eburnine, superlative most eburnine)
- (rare) Like ivory.
1958, Lawrence Durrell, Balthazar:On a square of grey silk lay several objects with a direct relationship to our brimming thoughts – the great hatpin with its ugly blue stone head, and the eburnine ring of my lover which I could not see even now without a pang.