What does carina mean?
Carina is a technical noun used chiefly in anatomy and biology to denote a keel-shaped ridge or projection. Its most familiar use is in human anatomy, where the carina is the cartilaginous ridge inside the windpipe at the point where the trachea divides into the two main bronchi — a critical landmark in bronchoscopy and airway procedures. In ornithology, the carina refers to the keel of a bird's sternum, the bone to which powerful flight muscles attach; its presence or absence helps distinguish strong fliers from flightless birds such as ostriches and emus. Botanists use the term for keel-like folds, notably the fused lower petals of flowers in the pea family. The word comes directly from Latin carina, meaning the keel of a ship, and shares that origin with the verb "to careen." Though rare outside scientific writing, carina offers precision in medical, zoological, and botanical description.
nounA ridgelike anatomical structure resembling a keel, such as the ridge at the base of the trachea where it divides into the bronchi. More generally, any keel-shaped projection or part in anatomy, zoology, or botany.
- In anatomy and medicine, the ridge of cartilage at the base of the trachea where it bifurcates into the two main bronchi.
- In zoology, especially ornithology, the keel of a bird's sternum to which flight muscles attach.
- In botany, a keel-shaped ridge or fold, such as the two fused lower petals of a papilionaceous flower.
"The surgeon noted a slight deviation of the tracheal carina during the bronchoscopy."
"The endoscopist identified the carina as the key landmark before advancing toward the right main bronchus."
"Flying birds possess a prominent sternal carina, whereas flightless ratites have a flat, keelless breastbone."
Both "carinas" and "carinae" are seen, but the Latinate plural "carinae" predominates in medical and scientific literature.
"The radiograph showed subtle asymmetries between the two mainstem bronchi just below the carinae of interest."
When astronomers split the giant old constellation Argo Navis into pieces, they literally kept the ship's keel — and that piece is still sailing the southern sky today as the constellation Carina.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of carina
Carina was borrowed directly from Latin, in which carina meant the keel of a ship — the structural spine running along a vessel's bottom. Anatomists adopted the term because these bodily ridges resemble a ship's keel in shape and function as central supporting structures. The same Latin root gave English the verb "careen," which originally described tilting a ship on its side to expose and clean the keel. The name of the southern constellation Carina likewise preserves the original nautical sense, having been carved out of the ancient ship constellation Argo Navis.
Related word forms
How carina is actually used
Carina is primarily a technical term used in medicine, anatomy, veterinary science, and biology; it rarely appears in everyday conversation. It is a Latin noun treated as regular in English pluralization contexts by specialists, who typically prefer the Latinate plural "carinae." Capitalized as "Carina," the word names both a southern constellation and, separately, a common given name.
Easily confused with carina
"Careen" is a verb meaning to lurch or swerve (or to heel over a ship for cleaning) and derives from the same Latin word carina, while "carina" is a noun naming an actual keel-like structure.
Capitalized, Carina is the southern constellation named after the ship's keel in Argo Navis; lowercase carina is the anatomical or biological term.