- a very dark blue colour; bluish black
- (as adjective)a midnight-blue suit
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
Examples from the Web for midnight blue
Historical Examples of midnight blue
Enveloped in a midnight-blue gown, she wandered out on deck.
She poked a hand from beneath her midnight-blue dressing gown.