(redirected from keel bone)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to keel bone: Stifle joint


 [kah-ri´nah] (pl. cari´nae) (L.)
a ridgelike structure.
carina tra´cheae a downward and backward projection of the lowest tracheal cartilage, forming a ridge between the openings of the right and left principal bronchi.
carina urethra´lis vagi´nae the column of rugae in the lower anterior wall of the vagina, immediately below the urethra.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


, pl.


(kă-rī'nă, -rī'nē),
1. In humans, a term applied or applicable to several anatomic structures forming a projecting central ridge.
2. That portion of the sternum in a bird, bat, or mole that serves as the origin of the pectoral muscles; it is not found in flightless birds or in most mammals.
[L. the keel of a boat]
Farlex Partner Medical Dictionary © Farlex 2012


(kə-rī′nə, -rē′-)
n. pl. cari·nae (-nē)
A keel-shaped ridge or structure, such as that on the breastbone of a bird or of the fused lower two petals of flowers of many members of the pea family.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


,pl. carinae (kă-rī'nă, -nē)
A term applied to anatomic structures forming a projecting central ridge.
[L. the keel of a boat]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(ka-ri'na) plural.carinae [L., keel of a boat]
A structure with a projecting central ridge.

carina nasi

The nasal carina.

nasal carina

Olfactory nasal sulcus.
Enlarge picture
CARINA OF THE TRACHEA: seen bronchoscopically

carina of the trachea

The ridge at the lower end of the trachea separating the openings of the two primary bronchi.
See: illustration

carina tracheae

The carina of the trachea.

carina of the urethra

The ridge extending posteriorly from the urethral orifice and continuous with the anterior column of the vagina.

carina urethralis

The carina of the urethra.
Medical Dictionary, © 2009 Farlex and Partners


Any keel-shaped ridge in the body, especially the ridge formed where the TRACHEA divides into the two bronchi.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005




  1. the keel-shaped edge of a leguminous flower, consisting of two fused lower petals. This may have a role in pollination, acting, for example, as a landing platform for bees.
  2. the breast-bone of a bird.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Welfare measurements of laying hens with different cage designs at 50 wk of ages (1,2) Category cage type CC SFC MFC-I Feather score 3.37 (a) 1.87 (ab) 2.62 (a) Claw score 0.89 (bc) 1.00 (b) 2.00 (a) Gait score 1.25 (a) 0.45 (b) 0.50 (b) Keel bone deformation 0.87 0.37 0.62 score Tonic immobility 69.88 (a) 49.63 (b) 53.87 (b) duration (s) Category cage type MFC-II MFC-III Feather score 1.20 (bc) 0.88 (c) Claw score 0.38 (bc) 0.33 (c) Gait score 0.37 (b) 0.38 (b) Keel bone deformation 0.25 0.38 score Tonic immobility 49.38 (b) 45.12 (b) duration (s) CC, conventional cage; SFC, small furnished cage; MFCI, middle furnished cage type I; MFCII, middle furnished cage type II; MFCIII, middle furnished cage type III.
Use of radiography to identify keel bone fractures in laying hens and assess healing in live birds.
On necropsy, grossly both birds were emaciated having ruffled feathers with prominent and wavy keel bone, coelomic cavity revealed atrophied and congested liver, slightly enlarged spleen and intestine with congested serosa.