• WordNet 3.6
    • v underlay provide with a base, support, lining, or backing "underlay the boards with joists"
    • v underlay put (something) under or beneath "They underlaid the shingles with roofing paper"
    • v underlay raise or support (the level of printing) by inserting a piece of paper or cardboard under the type "underlay the plate"
    • n underlay a pad placed under a carpet
    • ***
Webster's Revised Unabridged Dictionary
    • Underlay (Print) A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the form, to bring it, or any part of it, to the proper height; also, something placed back of a part of the tympan, so as to secure the right impression.
    • Underlay (Mining) The inclination of a vein, fault, or lode from the vertical; a hade; -- called also underlie.
    • v. i Underlay (Mining) To incline from the vertical; to hade; -- said of a vein, fault, or lode.
    • Underlay To lay beneath; to put under.
    • Underlay To put a tap on (a shoe).
    • Underlay To raise or support by something laid under; as, to underlay a cut, plate, or the like, for printing. See Underlay n., 2.
    • ***
Century Dictionary and Cyclopedia
    • underlay To lay beneath; put under; specifically, in printing, to reinforce with underlays.
    • underlay To support by laying something under.
    • underlay In mining, to incline from the perpendicular; hade: said of a vein. See the noun.
    • n underlay In mining, same as hade. The term underlay is that most commonly used by miners in speaking of the inclination of the lode; it is the complement of the dip, which latter term is in much more familiar use among geologists than either hade or underlay.
    • n underlay In printing, a bit or bits of paper put under types or a plate to make them of proper height for receiving a good impression.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Underlay un-dėr-lā′ to lay under or to support by something laid under
    • v.i Underlay to incline from the perpendicular
    • n Underlay a piece of paper pasted under woodcuts, stereotype plates, &c. in a form, to bring them up to the necessary level for printing
    • ***


Webster's Revised Unabridged Dictionary
AS. underlecgan,. See Under, and Lay (v. t.)


In literature:

After this another impression is taken, and of this sheet an "underlay" is made to further "even up" the form.
"The Building of a Book" by Various
She was very straightforward herself and generally had a very clear idea of what underlay any action or feeling on her part.
"The Squirrel-Cage" by Dorothy Canfield
I did not then understand the despair which underlay his iron quietness.
"The King's Mirror" by Anthony Hope
The whole political conception which underlay Lee's move was false.
"A History of the United States" by Cecil Chesterton
Perhaps the true explanation which underlay all this is to be found in the following Memorandum of the War Council of January 9th, 1915.
"1914" by John French, Viscount of Ypres
Two assumptions underlay the whole discussion, and were treated as axioms by nearly all the speakers.
"The Political History of England - Vol XI" by George Brodrick
The granite which underlay the folds of the first Sierra are still disclosed in the walls of the Yosemite Valley.
"The Book of the National Parks" by Robert Sterling Yard
The use of a double underlay in parts gives additional relief.
"Art in Needlework" by Lewis F. Day
The idea which underlay it was that the woman should render herself unattractive to other men.
"The Empire of the East" by H. B. Montgomery
He noted, but hardly considered, an older trail that underlay this one.
"Louisiana Lou" by William West Winter

In news:

VOC-Free Underlayment from MP Global Products.
With the right underlayment, this rainscreen variant provides waterproofing, drainage, and a striking appearance.
The publication contains information about roof decks, underlayments, asphalt shingles , construction details, and attic ventilation.
Underlay tympanoplasty with laser tissue welding.
Abstract We investigated the feasibility of using laser tissue welding techniques to perform transcanal underlay tympanoplasty.
Dyckhoff has extended its range of Trevira Bioactive textiles to include reusable underlays for beds.
Deck Defense roof underlayment .
The products will further differentiate the company's strength in the roofing underlayment and construction industries.
USG LEVELROCK Floor Underlayment Chicago.
The underlayment comprises a dual-compound composite sheet including a carrier sheet with a front side and a backside.
VOC -Free Underlayment from MP Global Products.
Norfolk, Neb.-based MP Global Products, a manufacturer of fiber acoustic underlayments, introduced VersaStick premium "green" pressure sensitive flooring adhesive .
Revision of D3676 - 07 Standard Specification for Rubber Cellular Cushion Used for Carpet or Rug Underlay.
Made with Invista yarns, the underlayment is primarily glimmer yarns.
DALTON, Ga.– Oriental Weavers USA is expanding its product roster to include area rug underlay.

In science:

The first of these was what might be described as the autocentric principle, which underlay the pre Copernican dogma to the effect that as terrestrial observers we occupy a privileged position at the center of the universe.
Anthropic principle in cosmology
However, to account for the coupling between the large scale envelope and the small scale underlaying the stripe state, we consider η as free parameter and κ a finite number.
Transversal interface dynamics of a front connecting a stripe pattern to a uniform state
We re-examine closely the long held underlaying philosophy of the STR emanating from the Principle of Relativity via the twin paradox gedanken.
The Twin Paradox Revisited and Reformulated -- On the Possibility of Detecting Absolute Motion
The bes t result was obtained with Hamamatsu PMTs (R5912-MOD) manufactured with Pt-underlay. A light but sufficiently strong mechanical support was constructed to withstand the buoyant force (≈1kN) acting on the PMTs in liquid argon.
Search for WIMPs in liquid argon
The cell was read out by two Hamamatsu R6091-01MOD PMTs with Pt-underlay for cryogenic operation.
Search for WIMPs in liquid argon