Definition that contains breastbone
- keel the median ridge on the breastbone of birds that fly
- carina any of various keel-shaped structures or ridges such as that on the breastbone of a bird or that formed by the fused petals of a pea blossom
- gladiolus the large central part of the breastbone
- manubrium the upper part of the breastbone
- mononychus olecranus a turkey-sized long-legged fossil 75 million years old found in the Gobi Desert having bird-like fused wrist bones and keeled breastbone and a long tail resembling a dinosaur's; short forelimbs end in a single claw instead of wings; classification as bird or dinosaur is in dispute
- corpus sternum the large central part of the breastbone
- chicken-breasted having a chest deformity marked by a projecting breastbone caused by infantile rickets
- protoavis most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs
- ratite flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
- carinate birds having keeled breastbones for attachment of flight muscles