an insulating flask that has double walls, usually of silvered glass, with an evacuated space between them. It is used for maintaining substances at high or low temperaturesAlso called: Thermos, Dewar flask
How Do You Change Passive Voice Into Active Voice?In active voice, the subject performs the action of the verb. In passive voice, the subject receives the action of the verb. If you feel like you need a little more than that, keep reading.
The Hardest Words To Spell Just Got A Whole Lot EasierTexts to mom. Emails to your boss. Resumes. Cover letters. Job applications. Orthography is everywhere, and, even if you're a master speller, most folks have that one word that has proven to be their spelling kryptonite. Now for a little good news. There's a secret to skirting those spelling speed bumps without revealing your fatal flaw: substitute a synonym.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012