primary rainbow
noun
The rainbow produced when light is dispersed within each raindrop by refraction with a single internal reflection, having colours ranging from red on the outside to violet on the inside, and which is the inner and usually brighter rainbow when two are seen.
Origin
Mid 17th century; earliest use found in Robert Hooke (1635–1703), natural philosopher.
- business rate
- business reply
- business school
- business sector
- business-speak
- business start-up
- business studies
- business suit
- business-suited
- business tourism
- business tourist
- business trip
- business union
- business unionism
- business unionist
- business unit
- businesswoman
- businessy
- busk
- busk-board
- busker
- buskin
- buskined
- busk point
- bus lane