Meaning of centerboard

cen•ter•board

Pronunciation: (sen'tur-bôrd", -bōrd"), [key]
— n. Naut.
  1. a pivoted fin keel that can be swung upward and aft within a watertight trunk when not in use.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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