Meaning

noun a projection or ridge that suggests a keel

noun the median ridge on the breastbone of birds that fly

noun one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability

originEtymology unknown. Proposed etymologies include a corruption of the surname Keough, a derivation from the surname Keel, or a derivation from keel, referring here to the shape of the rocks near the town's harbour.

Etymology from Wiktionary, CC BY-SA 3.0