Definition of "undersoil" [un•der•soil]

• Soil below the ground surface. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But for a thwarting stubborn undersoil -- a root, a rock -- Akeley was not killed instantly but remained between the tusks, holding on for bitter life."
• "Blackpool have suggested that their game against Liverpool is in doubt as, much to the irritation of the Premier League, they did not invest a portion of the windfall that they secured on promotion from the Championship last May in undersoil heating."
• "We have rich lands, a richer undersoil, unharnessed power in our rivers, falls and forests; our lakes and rivers are also rich in natural resources of all kind."