Definition of understructure in English:

understructure

Syllabification: un·der·struc·ture
Pronunciation: /ˈəndərˌstrəkCHər
 
/

noun

An underlying or supporting structure.

Definition of understructure in:

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Word of the day meretricious
Pronunciation: merəˈtriSHəs
adjective
apparently attractive but having in reality no value...