heptatonic

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 *ten-
Proto-Indo-European *-os
Proto-Indo-European *tónos
Proto-Hellenic *tónos
Ancient Greek τόνος (tónos)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ικός (-ikós)
Ancient Greek τονῐκός (tonĭkós)
English tonic
English heptatonic
From hepta- + tonic.