Webster's English Dictionary

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keel

1. keel \'ke-(*)l\ vb [ME kelen, fr. OE ce-lan, co-l cool] chiefly dial  : 
   COOL 
2. keel n [ME kele, fr. MD kiel; akin to OE ce-ol ship, cot sm]all house - 
   more at COT 1a: a flat-bottomed ship; esp : a barge used on the Tyne to 
   carry c oal 1b: a barge load of coal  2: a British unit of weight for coal 
   equal to 21.2 long tons 
3. keel n [ME kele, fr. ON kjo:lr; akin to OE ceole throat, beak of a]ship 
   - more at GLUTTON 1a: a longitudinal timber or plate extending along the 
   center of the bottom  of a ship and often projecting from the bottom 1b: 
   SHIP  1c: the assembly of members at the bottom of the hull of a semirigid 
   or rig id airship 2: a projection suggesting a keel; specif : CARINA 
4. keel vt : to cause to turn over  1: to turn over  2: to fall in or as if 
   in a faint - usu. used with over 
5. keel n [ME (Sc dial.) keyle] chiefly dial  1: RUDDLE  2: a colored 
   marking crayon used by engineers and surveyors