e·lec·tro·car·di·o·gram 
(ĭ-lĕk′trō-kärdē-ə-grăm′)
(ĭ-lĕk′trō-kärdē-ə-grăm′)n.
1. A graphic record of heart muscle activity recorded by an electrocardiograph.
2. The procedure performed to produce such a record. In both senses also called cardiogram.
electrocardiogram- macrofossil
- macrogamete
- macroglobulin
- macroglobulinemia
- macroglossia
- macrograph
- macrography
- macroinstruction
- macroinvertebrate
- macrolide
- macromere
- macromolecular
- macromolecule
- macron
- macronuclear
- macronucleus
- macronutrient
- macrophage
- macrophagic
- macrophysics
- macrophyte
- macrophytic
- macropod
- macropterous
- macroscopic