cardiology

Etymology

It is formed from English cardio- + -logy.^[2][3][4][5] Merriam-Webster classes it as International Scientific Vocabulary.^[6][7] The combining form cardio- is from New Latin cardio- and its source, the Ancient Greek καρδιο- (kardio-) of καρδία (kardía, “heart”),^[2] which Etymonline takes from Proto-Indo-European *kerd- (“heart”).^[3] The suffix -logy goes back to -λογία (-logía), from -λόγος (-lógos, “one who deals with a certain topic”).^[8] The OED notes an earlier cardialogy, from French cardialogie (1753 or earlier) and scientific Latin cardialogia, recorded in a dictionary of 1777.^[2]

Earliest recorded meaning

The scientific study of the heart: 1837, in the Analyst.^[2] Etymonline and Merriam-Webster give 1847,^[3][6][7] and Dictionary.com dates it to 1840–50.^[5]

Semantic evolution

At first the word named the study of the heart in general; in later use it came to mean specifically the branch of medicine that diagnoses and treats heart disorders.^[2] The agent noun cardiologist is recorded from 1885,^[3] the late 19th century in the Shorter Oxford, and cardiological from the early 20th century.^[4]

Timeline

• 1837 – the scientific study of the heart; later, the medical specialty of heart disorders.^[2] Etymonline and Merriam-Webster date the word to 1847.^[3][6]
• 1885 – cardiologist, a specialist in cardiology.^[3]
• early 20th century – the adjective cardiological.^[4]

Meanings

Noun

1. The branch of medicine concerned with the heart, its structure and function, and the diagnosis and treatment of its diseases: She is training in cardiology at a teaching hospital.^{[9][6][10][2]}

Word family

• cardiological
• cardiologist

Related words

• cardiac
• cardio-
• -logy
• cardiogram
• heart

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
8. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
9. ^ Collins English Dictionary (2023), Glasgow: HarperCollins
10. ^ The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin