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Definition of rainbow : 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.

Synonyms:

castle in the air, fantasy, colors, real, dream, bubble, prism, pipe dream, chimera, illusion

shade, spectrum, color, dye, palette, complexion, pigment, paint, hue, tincture, ink, tint, tone, stain

dichromic, variegated, calico, colorful, tartan, mosaic, parquet, freckled, streaked, kaleidoscopic, striated, dappled, motley, flecked, checked, parti-colored, multicolor, plaid, polychromatic, striped, patchwork, harlequin, tessellated, checkered, marble, varicolored

Usage examples:

• 1. A fragment of a rainbow bright Through the moist air I see, All dark and damp on yonder height, All bright and clear to me. - "McGuffey's Fifth Eclectic Reader", William Holmes McGuffey.
• There are no black lines between the colours in a real rainbow. - "A Book of Quaker Saints", Lucy Violet Hodgkin.
• There is a rainbow over the Rhine. - "The Red Cross Girls with Pershing to Victory", Margaret Vandercook.