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- symmetric key cryptography
- symmetric matrix
- symmetrization
- symmetrize
- symmetry
- Symonds
- Symons
- sympathectomy
- sympathetic
- sympathetically
- sympathetic ink
- sympathetic nervous system
- sympathize
- sympathizer
- sympathizingly
- sympatholytic
- sympathomimetic
- sympathy
- sympathy strike
- sympatric
- sympatrically
- sympatry
- sympetalous
- symphonic
- symphonic poem