royal blue

American  

noun

1. a deep blue, often with a faint reddish tinge.

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royal blue British  

noun

1. 1. a deep blue colour

   2. ( as adjective )

      a royal-blue carpet

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Etymology

Origin of royal blue

First recorded in 1810–20

Compare meaning

How does royal-blue compare to similar and commonly confused words? Explore the most common comparisons:

• cobalt blue vs. royal blue
• cobalt vs. royal blue

Example Sentences

The vessels are glazed a deep, glossy royal blue.

From The Wall Street Journal • Oct. 1, 2025

First, and most obviously, the boy born in Barbados could have quite easily been in maroon instead of royal blue, in the away dressing room rather than on his home ground for Warwickshire.

From BBC • May 29, 2025

So there’s no turning that whole place royal blue and yellow.

From Los Angeles Times • Apr. 6, 2025

The entire room, including the ceiling and floor, had been painted royal blue.

From Slate • Oct. 20, 2024

Somehow, I managed to get myself dressed: gray socks, tan pants, white long-sleeved shirt, black and royal blue striped school tie, dark navy sweater vest, black shoes.

From "Winger" by Andrew Smith