cobalt blue

noun

1

: a greenish-blue pigment consisting essentially of cobalt oxide and alumina

2

: a strong greenish blue

Examples of cobalt blue in a Sentence

Recent Examples on the Web

From tangy tangerine to bold cobalt blues and electric purples, the most vibrant nail polishes for summer go with pretty much anything. — Audrey Noble, Vogue, 2 July 2026

After appearing on the red carpet in a high-drama red gown, the actress changed into a sultry cobalt blue number from the Tom Ford Resort 2026 line. — Meg Walters, InStyle, 29 June 2026

Color also stood out, with vibrant reds, dusty pastels and pops of cobalt blue adding visual interest to otherwise monochromatic looks. — Rhonda Richford, Footwear News, 29 June 2026

While the duchess opted to personalize her version with cobalt blue letters on a navy body, shoppers can choose from three additional sizes and 14 additional colors — plus up to three letters — to craft their ideal bag. — Averi Baudler, PEOPLE, 11 June 2026

Word History

First Known Use

1835, in the meaning defined at sense 1

Rhymes for cobalt blue

• accrue
• ado
• ainu
• aircrew
• airscrew
• anew
• askew
• baboo
• babu
• bamboo
• beaucoup
• bijou