rheocardiogram

Etymology tree
Proto-Indo-European *ser-?
Proto-Indo-European *srew-
Proto-Indo-European *sréweti
Proto-Hellenic *hréwō
Ancient Greek ῥέω (rhéō)
English rheo-
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 rheocardiogram
From rheo- + cardiogram.