English dictionary

rainbow

/'r/eI/n,b/oU/

Definitions, examples, synonyms and antonyms from WordNet 3.0.

noun

an arc of colored light in the sky caused by refraction of the sun's rays by rain

noun.object

Source: WordNet 3.0
an illusory hope

noun.cognition

Examples
Chasing rainbows.

Source: WordNet 3.0
A bow or arch exhibiting, in concentric bands, the several colors of the spectrum, and formed in the part of the hemisphere opposite to the sun by the refraction and reflection of the sun's rays in drops of falling rain.

noun

Source: webster1913