[sen-ter-bawrd, -bohrd]
noun Nautical.
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.

1840–50, Americanism; center + board Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To centerboard
Example sentences
To move among them without a collision is to sail without benefit of a
  centerboard or rudder.
The hold, once separated by the centerboard trunk, is now open.
The centerboard trunk is made from cypress bed logs and sugar pine sides.
The canoe has a centerboard and carries springboards for use when racing.
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