say it: il-ek-troh-KAHR-dee-uh-gram
electrocardiogram is a noun meaning "a graphical recording of the cardiac cycle produced by an electrocardiograph". It carries one recorded sense.
a graphical recording of the cardiac cycle produced by an electrocardiograph
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for electrocardiogram come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.