Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cardiograph is a noun meaning "medical instrument that records electric currents associated with contractions of the heart". It carries 2 recorded senses.
medical instrument that records electric currents associated with contractions of the heart
a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles
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 cardiograph come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.