antitwilight arch

[an-tee-twahy-lahyt, an-tahy-]

noun

a narrow band, pink or with a purple cast, that sometimes appears at twilight just above the horizon opposite the sun.

Origin of antitwilight arch

anti- + twilight

Also called anticrepuscular arch.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018