'Navy blue' definitions:

Definition of 'navy blue'

From: WordNet
noun
A dark shade of blue [syn: dark blue, navy, navy blue]

Definition of 'Navy blue'

From: GCIDE
  • Navy blue \Na"vy blue`\, n.
  • 1. A dark grayish blue. Also called navy. [PJC]
  • 2. Prussian blue. [archaic] [Webster 1913 Suppl. +PJC]