magnetocardiogram

Etymology tree
Pre-Greekbor.?
Ancient Greek Μάγνης (Mágnēs)
Ancient Greek μᾰ́γνης (mắgnēs)bor.
Old French magnetebor.
▲
Ancient Greek μᾰ́γνης (mắgnēs)bor.
Latin magnēsbor.
Middle English magnete
English magnet
English magnet-
Ancient Greek -ο- (-o-)der.
Latin -o-bor.
English -o-
English magneto-
Proto-Indo-European *ḱerd-
Proto-Indo-European *ḱḗr
Proto-Indo-European *ḱr̥díyeh₂
Proto-Hellenic *kərdíyā
Ancient Greek καρδία (kardía)lbor.
English cardio-
Proto-Indo-European *gerbʰ-
Proto-Hellenic *grə́pʰō
Ancient Greek γρᾰ́φω (grắphō)
Proto-Indo-European *-mn̥
Ancient Greek -μᾰ (-mă)
Ancient Greek γράμμα (grámma)lbor.
English -gram
English cardiogram
English magnetocardiogram
From magneto- + cardiogram.