What does "pigeon-breasted" mean?

Having a breast like a pigeon's, the sternum being so prominent as to constitute a deformity.

What is a synonym for "pigeon-breasted"?

Common synonyms include: chicken-breasted, mammalian.

adj

adj ·Rare ·Advanced level

Adjective

1
Having a breast like a pigeon's, the sternum being so prominent as to constitute a deformity. dated

Adjective

1
having a chest deformity marked by a projecting breastbone caused by infantile rickets wordnet