·Impf & ·p.p. of Keel.
II. Keeled ·adj Having a median ridge; carinate; as, a keeled scale.
III. Keeled ·adj Keel-shaped; having a longitudinal prominence on the back; as, a keeled leaf.
Keel slightly arched upwards in the middle of the length, but not actually hogged. ...
The Sailor's Word-Book