Roget's Thesaurus: Entry 211 (Base)

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#211. Base. -- N. base, basement; plinth, dado, wainscot; baseboard, mopboard[obs]; bedrock, hardpan [U.S.]; foundation &c. (support) 215; 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.

Adj. bottom, undermost, nethermost; fundamental; founded on, based on, grounded on, built on.