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v. Simple past tense and past participle of keel.

adj. Furnished with a keel, especially a keel of a specified type

adj. Keel-shaped; having a longitudinal prominence on the back.

adj. Having a median ridge; carinate.

Having a keel; furnished with or exhibiting a longitudinal ridge resembling the keel of a boat, as a leaf or other object; ridged lengthwise in the middle underneath, as the sternum of a carinate bird (see cut under carinate); carinated.

adj. having a ridge or shaped like a ridge or suggesting the keel of a ship

"Although he makes the point that the periphery is "hardly to be called keeled", to me "carinated", "angular" and "keeled" all mean more or less the same thing, especially when the degree of carination is variable."

keel-shaped    carinate   

keel