light pipe

American  

noun

Optics.

1. an elongated transparent medium, such as an optical fiber, for transmitting light.

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Etymology

Origin of light pipe

First recorded in 1945–50

Example Sentences

These include its newly redesigned thumb buttons, PCBs, and what Bolt calls its “impressive light pipe design.”

From The Verge

An occasional box of good Egyptian cigarettes or a nice light pipe, or one or two khaki handkerchiefs or a toothbrush would be most acceptable.

From BBC

They have succeeded with the aid of the laparoscope, a tube containing a "light pipe," less than half an inch in diameter.

From Time Magazine Archive

This familiar principle causes the rod to act as a "light pipe."

From Time Magazine Archive

The charm of the phrase lies precisely in this subtle but important ambiguity. :light pipe: /n./

From Project Gutenberg