from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A vacuum bottle used to keep beverages hot or cold.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a vacuum flask or bottle which can keep liquids at a desired temperature.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. vacuum flask that preserves temperature of hot or cold drinks
Originally a trademark.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Thermos, a trademarked name, from Ancient Greek θερμός (thermos, "warm") (Wiktionary)