There are 2 main definitions of keel in English:

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keel1

Syllabification: keel
Pronunciation: /kēl
 
/

noun

1The longitudinal structure along the centerline at the bottom of a vessel’s hull, on which the rest of the hull is built, in some vessels extended downward as a blade or ridge to increase stability.
Example sentences
  • Support the keel with timber blocking to take most of the weight of the hull.
  • Even nautical archaeology has made great gains, for many of the waterfront structures incorporated broken-up vessel fragments, hull planking, keels, a prow, a side rudder, ribs, a mast partner.
  • Again the men were coerced under once more, and made to endure yet another rake along the keel of the ship, where lurked the treacherous gatherings of barnacles.
1.1 Zoology A ridge along the breastbone of many birds to which the flight muscles are attached; the carina.
Example sentences
  • The sternum, or breastbone, bears a prominent keel where the flight muscles attach.
  • M. gui's sternum didn't have a keel upon which large flight muscles could be attached.
  • It has a distinct fold of flesh, marked by a line of hair that runs like a keel along its belly.
1.2 Botany A prow-shaped pair of petals present in flowers of the pea family.
Example sentences
  • Within-flower transfer of pollen from anthers to stigma was achieved by depressing the keel petal of newly opened flowers using fine forceps.
  • The reproductive organs are enclosed within the keel petals.
  • As in other specimens of D. zenos, a ventral keel is not present.
1.3 literary A ship.

verb

[no object] (keel over) Back to top  
1(Of a boat or ship) turn over on its side; capsize.
Example sentences
  • It proved the final blow for the Neptune; the ship slowly keeled over and sank.
  • Finally in October, it became obvious that they were going to lose the ship as it had keeled over, and was listing to port.
  • After being given a crash-course in rowing, my first hurdle was to get into the boat without it keeling over.
Synonyms
capsize, turn turtle, turn upside down, founder;
overturn, turn over, flip (over), tip over
1.1 informal (Of a person or thing) fall over; collapse.
Example sentences
  • Soon enough we were in the hallway, keeling over holding our sides.
  • I crossed to the other side and found Ewen keeled over on the ground.
  • Drew has keeled over to one side of the sofa and is laughing hysterically into the cushions.
Synonyms
collapse, faint, pass out, black out, lose consciousness, swoon

Origin

Middle English: from Old Norse kjǫlr, of Germanic origin.

Derivatives

keeled

1
adjective
[in combination]: a deep-keeled yacht

keelless

2
adjective
Example sentences
  • Physically, breeding stock should have keelless breasts and broad backs.
  • This is something you simply cannot do in a keelless flat bottom boat.
  • The carapace (upper shell) is olive to dark brown to almost black, patternless, smooth and keelless.

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There are 2 main definitions of keel in English:

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keel2

Syllabification: keel
Pronunciation: /kēl
 
/

noun

British
A flat-bottomed freight boat; a keelboat.
Example sentences
  • The original Tyne keel was clinker-built but later types were of carvel build.
  • The earliest recorded use of Keels for transporting coal on the Tyne is in the early 1300's.

Origin

Middle English: from Middle Low German kēl, Middle Dutch kiel 'ship, boat'.

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