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center of gravity
center of mass
center of pressure
center punch
center spot
center spread
center stage
center three-quarter
centerboard
Centereach
centered
centered stance
centerfold
centerline
centerpiece
Centers for Disease Control and Prevention
Centerville
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centerboard

cen·ter·board [ séntər bàwrd ] (plural cen·ter·boards)


noun 
Definition:
 
retractable keel: a keel in a sailboat that can be retracted upward in shallow water

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