Search Result for "daggerboard": 
Wordnet 3.0

NOUN (1)

1. a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel; 



WordNet (r) 3.0 (2006):

daggerboard
    n 1: a removable centerboard on a small sailboat that can be
         lowered into the water to serve as a keel