from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An inflatable air mattress.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a type of inflatable air mattress
From the name of the company which made rubberised canvas air-mattresses from the 1940s to the 1970s under the trademark name "LI-LO" (perhaps from lie low). (Wiktionary)