Definition of underlayment in English:

underlayment

Syllabification: un·der·lay·ment
Pronunciation: /ˌəndərˈlāmənt/

Entry from US English dictionary

noun

A layer between a subfloor and a finished floor that facilitates leveling and adhesion: the underlayment may be of hardboard or particle board of various thicknesses

Definition of underlayment in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily