amaranthine

/ˌæm.əˈɹæn.θɪn/

Etymology

Coined by Milton, originally meaning "unfading", as amaranth + -ine, from Ancient Greek ἀμάραντος (amárantos, “unfading”). Later used for color. First attested in the 1660s.

amaranthine means of a dark reddish purple colour. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

Why this word is great

AMARANTHINE — [Adjective] Of a dark reddish-purple color; or, poetically, of an unfading and eternal quality. From the English amaranth (a flower name) + -ine (adjectival suffix), with amaranth itself from Ancient Greek ἀμάραντος (amárantos, "unfading, everlasting"). Unlike "ephemeral," which concedes to time, or "magenta," a brash and chemical hue, amaranthine carries the weight of antiquity and endurance. It is the deep stain of a long-fermented wine, the velvety shadow of a rose preserved in a forgotten book, and the last, lingering flush of sunset held in the sky long after the sun has fallen—a word that mourns the very transience it denies.

adj

Of a dark reddish purple colour.
Unfading, eternal, immortal, infinite.“[…] The angelick blast Filled all the regions: from their blisful bowers Of amarantine shade, fountain or spring, By the waters of life, where’er they sat In fellowships of joy, the sons of light Hasted, resorting to the summons high”
Relating to the mythical amaranth flower that never fades.
Relating to, or having the form of plants of the genus Amaranthus.

noun

A dark reddish-purple colour.“The giantesses lift arms like the trunks of sycamores, each finger tipped with an amaranthine talon.”
The amaranth flower.“Ah! when the eternal morning dawns, And amaranthines shall displace the thorns […]”