Search Result for "merrimac": 
Wordnet 3.0

NOUN (1)

1. an ironclad vessel built by the Confederate forces in the hope of breaking the blockade imposed by the North; 



WordNet (r) 3.0 (2006):

Merrimac
    n 1: an ironclad vessel built by the Confederate forces in the
         hope of breaking the blockade imposed by the North