Meaning of UNDERSTRUCTURE

Pronunciation:			'undur`strukchur
WordNet Dictionary
	Definition:		[n]  lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"
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	Synonyms:		base, foot, foundation, fundament, groundwork, substructure
	See Also:		bed, construction, raft foundation, structure, support