Etymology
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shades (n.)

"sunglasses," 1958, American English, plural of shade (n.).

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Definitions of shades

shades (n.)
(plural) something that reminds you of someone or something;
aren't there shades of 1948 here?
shades (n.)
(plural) spectacles that are darkened or polarized to protect the eyes from the glare of the sun;
he was wearing a pair of mirrored shades
Synonyms: sunglasses / dark glasses
From wordnet.princeton.edu