
- Blue - Wikipedia- Darker shades of blue include ultramarine, cobalt blue, navy blue, and Prussian blue; while lighter tints include sky blue, azure, and Egyptian blue (for a more complete list see the List of colours). 
- What to know about methylene blue - Harvard Health- Apr 24, 2025 · Once used to treat malaria, methylene blue is gaining attention for a range of health-related uses. Learn where it started, how it works, and what the evidence says about its … 
- BLUE Definition & Meaning - Merriam-Webster- The meaning of BLUE is of the color whose hue is that of the clear sky : of the color blue. How to use blue in a sentence. 
- BLUE | English meaning - Cambridge Dictionary- BLUE definition: 1. of the colour of the sky without clouds on a bright day, or a darker or lighter type of this…. Learn more. 
- Blue | Description, Etymology, & Facts | Britannica- Sep 3, 2025 · Blue is a basic colour term added to languages after black, white, red, yellow, and green. The term blue derives from Proto-Germanic blæwaz and Old French blo or bleu. 
- The Meaning and Psychology of Blue in Life & Design- Apr 23, 2025 · Blue, a color that commands a unique position in the color spectrum, has permeated various aspects of our lives, imbuing them with profound meanings and emotions. … 
- BLUE Definition & Meaning | Dictionary.com- Blue definition: the pure color of a clear sky; the primary color between green and violet in the visible spectrum, an effect of light with a wavelength between 450 and 500 nanometers.. 
- The Color Blue: Meaning, Color Psychology, Effects - Verywell Mind- Feb 20, 2024 · The color blue is associated with feelings of calm and relaxation. Learn about blue's other meanings and its role in color psychology, as well as our feelings and behaviors. 
- All About the Color Blue | Meaning, Color Codes and Facts- Jul 11, 2023 · In this blog post, we dive into the beautiful depths of the color blue, exploring its history, symbolism, similar shades, and complex color codes. Blue, as timeless as the sky and … 
- BLUE definition in American English | Collins English Dictionary- If you are feeling blue, you are feeling sad or depressed, often when there is no particular reason.