heptamethyl

Etymology tree
Proto-Afroasiatic *sṗɣ?
Proto-Semitic *šabʕ-bor.?
Proto-Indo-European *septḿ̥
Proto-Hellenic *heptə́
Ancient Greek ἑπτᾰ́ (heptắ)bor.
English hepta-
Proto-Indo-European *médʰu
Proto-Hellenic *métʰu
Ancient Greek μέθυ (méthu)
Proto-Indo-European *swel-der.?
Ancient Greek ῡ̔́λη (hū́lē)der.
German -yl
German Methylbor.
English methyl
English heptamethyl
From hepta- + methyl.