lampshade

[lamp-sheyd]

noun

a shade, usually translucent or opaque, for shielding the glare of a light source in a lamp or for directing the light to a particular area.

Origin of lampshade

First recorded in 1840–50; lamp + shade

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

The shadow of the lamp-shade had cut me off altogether from their thoughts.
The Copperhead
Harold Frederic
He was carrying a piece of yellow-fluff, part of a lamp-shade, as far as I could judge.
Idle Ideas in 1905
Jerome K. Jerome
And the lamp-shade, and all those crochet things of every kind and shape!
Roumanian Stories
Various
On the ceiling he saw a dark circle—the shadow of the lamp-shade.
The Schoolmistress and Other Stories
Anton Chekhov
He sat silent, with his arms folded; and his head remained in the shadow cast by the lamp-shade.
The Eight Strokes of the Clock
Maurice Le Blanc

also lampshade, 1829, from lamp + shade (n.).