adamantyl

Etymology tree
Proto-Indo-European *né
Proto-Indo-European *n̥-
Proto-Hellenic *ə-
Ancient Greek ἀ- (a-)?
Proto-Indo-European *demh₂-der.
Ancient Greek δαμνάω (damnáō)?
Ancient Greek ἀδάμας (adámas)
Proto-Indo-European *-nós
Proto-Italic *-nos
Latin -nus
Latin -ānusder.
English -ane
English adamantane
Proto-Indo-European *swel-der.?
Ancient Greek ῡ̔́λη (hū́lē)der.
Frenchder.
English -yl
English adamantyl
From adamantane + -yl.