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centerboard

[sen-ter-bawrd, -bohrd] /ˈsɛn tərˌbɔrd, -ˌboʊrd/
noun, Nautical
1.
a pivoted fin keel that can be swung upward and aft within a watertight trunk when not in use.
Also called drop keel.
Compare daggerboard.
Origin
1840-1850
1840-50, Americanism; center + board
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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