dagger-board

daggerboard

[dag-er-bawrd, -bohrd]
noun Nautical.
a removable board on a small sailboat, typically of small dimension fore and aft, lowered into the water through a trunk to serve as a keel.
Compare centerboard.


Origin:
dagger + board

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World English Dictionary
daggerboard (ˈdæɡəˌbɔːd)
 
n
Compare centreboard a light bladelike board inserted into the water through a slot in the keel of a boat to reduce keeling and leeway

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