Pronunciation: (un"dur-lād'), [key]
1. placed or laid underneath, as a foundation or substratum.
2. having an underneath layer (often fol. by with): a lace tablecloth underlaid with damask; courtesy underlaid with reserve.
pt. and pp. of underlay.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.