Definition of "innerspring" [innerspring]

• Having numerous coil springs enclosed by a padded cover: an innerspring mattress. (adjective)

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.

• "The new couch is also a sofa bed (very comfortable with innerspring mattress) so we got rid of the huge and ugly futon from the playroom."
• "After 10 years, a regular innerspring mattress will weigh twice what it did when you bought it, because it will be full of dust and debris and dustmites and dustmite droppings."
• "MattressesWe tested 14 popular models of innerspring, memory-foam, and adjustable-air mattresses to see what you get for the money and assessed the models in this chart."