From The Collaborative International Dictionary of English v.0.44 [gcide]:
Underside \Un"der*side'\, noun The lower or lowest side of anything. --Paley.
From WordNet (r) 2.0 [wn]:
noun
1: the lower side of anything [syn: {bottom}, {undersurface}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
21 Moby Thesaurus words for "underside": bed, bedrock, belly, bottom, bottom side, breech, buttocks, downside, fundament, hardpan, lower side, lowest layer, lowest level, nether side, nethermost level, rock bottom, sole, substratum, underbelly, underlayer, underneath
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