keel
— Noun
– English
～ one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability
keel
— Noun
– English
～ the median ridge on the breastbone of birds that fly
keel
— Noun
– English
～ a projection or ridge that suggests a keel
keel arch
— Noun
– English
～ a pointed arch having an S-shape on both sides
keel
— Verb
– English
～ walk as if unable to control one's movements; "The drunken man staggered into the room"