What does caducei mean?
Caducei is the plural of caduceus, the winged staff entwined by two serpents that served as the attribute of Hermes, the Greek god of messengers, traders, and travelers — known to the Romans as Mercury. In classical art the god appears bearing these caducei, and the emblem came to signify heraldry, peaceful negotiation, and commerce rather than medicine. Despite this origin, in the United States the caduceus was widely adopted by medical organizations in the nineteenth and twentieth centuries, so caducei today frequently decorate hospitals, insignia, and publications connected with the healing professions, even though the more accurate medical symbol is the single-serpented rod of Asclepius. The word derives from Latin caduceus, borrowed from Greek kērykeion, meaning herald's staff. Caducei is a formal term encountered mainly in art history, mythology, and heraldic writing, and it is considerably rarer than its singular form.
nounThe plural of 'caduceus': the winged staff entwined by two serpents, carried as an emblem by the Greek messenger god Hermes (Roman Mercury) and long adopted as a symbol of commerce, negotiation, and — especially in the United States — medicine.
- The winged, serpent-entwined staff carried by Hermes/Mercury, used in classical art and literature as his attribute.
- Any representation of that staff, especially as an emblem or decorative device (for example on seals, insignia, or buildings).
- By modern extension, emblems modeled on the caduceus when used to signify medicine or the healing professions.
"Above the entrance hung two gilded caducei, marking the building as the offices of a medical association."
"On ancient vases, Hermes is often shown holding one of his distinctive caducei."
"The hospital's letterhead bore a pair of crossed caducei beneath its founding date."
Caducei is the standard plural of the noun caduceus, following Latin morphology; pronounce it kuh-DOO-see-eye or kuh-DYOO-see-eye.
"Both caducei flanked the coat of arms on the institution's seal."
Those twin snakes on a doctor's badge? Technically they belong to the god of merchants, not healers — a centuries-old mix-up that stuck.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of caducei
Caducei is the Latin plural of caduceus, which English borrowed from Latin in the early modern period. The Latin word itself comes from the Greek kērykeion, the staff carried by a kēryx (herald), a derivative of the Indo-European root behind words for proclamation such as kērygma ('proclamation'). The plural retains the Latin second-declension ending -ī, reflecting the word's learned, classical transmission into English.
Related word forms
How caducei is actually used
Formal and largely literary or scholarly in register; the singular 'caduceus' is far more frequent than the plural. In British English the first vowel is typically closer to 'yoo', while American English favors 'oo'. Because the plural looks unusual, writers sometimes mistakenly treat it as a singular form.
Easily confused with caducei
The rod of Asclepius has a single serpent and no wings and is the true symbol of medicine, whereas caducei — the two-snake, winged staves of Hermes — originally symbolized commerce and heraldic negotiation.