1. (noun) foundation, base, fundament, foot, groundwork, substructure, understructure
lowest support of a structure
Synonyms: metrical unit, bottom, foundation garment, founding, tail, groundwork, pes, al-Qaida, instauration, butt, pedestal, substructure, posterior, rear end, infantry, introduction, can, ft, nates, al-Qaeda, theme, basis, innovation, fundament, invertebrate foot, nucleotide, foundation, buttocks, prat, radical, root, animal foot, floor, stern, metrical foot, seat, foot, backside, bum, tooshie, grounding, buns, arse, institution, hindquarters, tail end, behind, origination, understructure, alkali, cornerstone, base, hind end, derriere, rump, ass, home, keister, stem, base of operations, radix, root word, stand, rear, fanny, human foot, infrastructure, tush, initiation, al-Qa'ida, creation, bag
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Synonyms and Antonyms of understructure 
