cloud·bow 
(kloudbō′)
(kloudbō′)n.
A faint white or yellowish arc-shaped light, similar to a rainbow, that sometimes appears in clouds opposite the sun.
[CLOUD + (RAIN)BOW.]
- unrehearsed
- unrelenting
- unrelentingly
- unreliability
- unreliable
- unreliableness
- unreliably
- unrelieved
- unrelievedly
- unreligious
- unremarkable
- unremarkably
- unremarked
- unremitting
- unremittingly
- unremittingness
- unrepentant
- unrepentantly
- unreproved
- unrequited
- unrequitedly
- unreserve
- unreserved
- unreservedly
- unreservedness