a projection or ridge that suggests a keel
the median ridge on the breastbone of birds that fly
one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability
a projection or ridge that suggests a keel
the median ridge on the breastbone of birds that fly
one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability