Underside

Noun

 * 1) The side that is below or underneath, the bottom.

Thesaurus
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

Anagrams

 * undesired