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
Webster's English Dictionary