centerboard

• POS: Noun
• HYPHEN: cen=ter=board

CIDE DICTIONARY

centerboard, n. 

 A retractable or sliding keel used on sailboats, formed of a broad board or slab of wood or metal which may be raised into a water-tight case amidships, when in shallow water, or may be lowered to increase the area of lateral resistance and prevent drifting to leeward when the vessel is beating to windward. It is used in vessels of all sizes along the coast of the United States  [1913 Webster]

OXFORD DICTIONARY

centerboard, US var. of CENTREBOARD.

ROGET THESAURUS

centerboard

Base

N base, basement, plinth, dado, wainscot, baseboard, mopboard, bedrock, hardpan, foundation, substructure, substratum, ground, earth, pavement, floor, paving, flag, carped, ground floor, deck, footing, ground work, basis, hold, bilge, bottom, nadir, foot, sole, toe, hoof, keel, root, centerboard, bottom, undermost, nethermost, fundamental, founded on, based on, grounded on, built on.