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.
- left field
- left-footed
- left hand
- left-hand drive
- left-handed
- left-handedly
- left-handedness
- left-hander
- left-hand rule
- left heart
- leftie
- leftish
- leftism
- leftist
- left-leaning
- left luggage
- left luggage office
- leftmost
- left-of-centre
- leftover
- left, right, and centre (also left and right or right and left)
- left turn
- leftward
- left wing
- left-winger