cardiograph
noun
car·dio·graph ˈkär-dē-ə-ˌgraf 
: an instrument that graphically registers movements of the heart
cardiographic
ˌkär-dē-ə-ˈgra-fik
adjective cardiography
ˌkär-dē-ˈä-grə-fē
noun 
Example Sentences
Recent Examples on the Web And the cardiograph, which measures the beatings of the heart. 
Megan Garber, The Atlantic, 29 Mar. 2018
Megan Garber, The Atlantic, 29 Mar. 2018 Word History
Etymology
International Scientific Vocabulary
First Known Use
1866, in the meaning defined above
Medical Definition
cardiograph
noun
car·dio·graph -ˌgraf
: an instrument that registers graphically movements of the heart
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