underlay

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underlay

felt, rubber, etc., laid beneath a carpet to increase insulation and resilience
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Underlay

Material laid directly on the floor to act as a padding; generally for the installation of carpet.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

underlay

[¦ən·dər¦lā]
(graphic arts)
The process of equalizing the impression of the press by inserting small pieces of paper beneath the type form.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

underlay

1. Same as underlayment.
3. A layer, such as asphaltic felt, which isolates a roof covering from the substructure; underfelt.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.