Definitions
1.NounA longitudinal ridge or projection like the keel of a boat.
2.NounPart of a papilionaceous flower consisting of two petals, commonly united, which encloses the organs of fructification.
3.NounThe keel of the glume of grasses.
4.NounThe principal nerve of a sepal.
5.NounThe keel of the breastbone of birds.
6.NounAny of several features that have a projecting central ridge.