underneath, base, root; see bottom 1, foundation 2.
"underside." YourDictionary, n.d. Web. 11 October 2018. <http://thesaurus.yourdictionary.com/underside>.
underside. (n.d.). Retrieved October 11th, 2018, from http://thesaurus.yourdictionary.com/underside
A side or surface that is below or under:
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