tert-butyl

Etymology tree
Proto-Indo-European *tréyes
Proto-Indo-European *tri-
Proto-Indo-European *-tós
Proto-Indo-European *tritós
Proto-Italic *tritios
Latin tertiusder.
English tert-
Proto-Indo-European *gʷṓws
Proto-Hellenic *gʷous
Ancient Greek βοῦς (boûs)
Proto-Indo-European *tewh₂-
Proto-Indo-European *-rós
Proto-Indo-European *tuh₂rós
Proto-Hellenic *tūrós
Ancient Greek τῡρός (tūrós)
Ancient Greek βούτῡρος (boútūros)der.
English but-
Proto-Indo-European *swel-der.?
Ancient Greek ῡ̔́λη (hū́lē)der.
Frenchder.
English -yl
English butyl
English tert-butyl
From tert- + butyl.