Gobo: One Word, Three Completely Different Jobs
Some words show up in one place and stay there. Gobo refused that assignment. It managed to find work in Hollywood, on Broadway, inside recording studios, and in Japanese kitchens. All before most people had ever heard of it.
What a Gobo Actually Does (In Three Industries)
In cinematography, a gobo is a dark plate or screen used to shield a lens from unwanted light. Not glamorous. Extremely necessary. The earliest print citation for this use is the New York Times, October 21, 1923 -- which means gobos have been doing thankless light-blocking work for over a century.
Theatre borrowed the word for something slightly different: a partial screen placed in front of a spotlight to project a shape or image, or just to cut down light on stage. Same gobo, different job. This version can throw projected images up to 6 meters in diameter, which is considerably more exciting. You can use colour films, slides, or moving images. A gobo in theatre is basically a tiny projector's first cousin.
Audio engineers use gobos too. Theirs are portable shields that stop microphones from picking up extraneous noise. The first recorded use in audio context shows up in a 1930 glossary from the Academy of Motion Pictures in Hollywood. Three gobos, three industries, all in the same city at roughly the same time.
The Elephant Ear Problem
Gobos apparently needed subcategories. The Los Angeles Times in November 1925 described something called an "elephant ear": an upright post with a black card suspended at right angles, used to shade a camera lens from overhead light. Six years later, a Massachusetts newspaper described the elephant ear as a small gobo for conversational close-ups.
So there were gobos, and then there were gobos shaped like elephant ears. The word was already proliferating.
Where Did This Word Even Come From
Here is where it gets satisfying for word nerds: nobody is sure.
The OED revised its entry for gobo (the technical meaning) in 2016 and landed on this etymology: "Origin uncertain; perhaps from gob- (in go-between) + -o suffix."
Perhaps. Maybe. Possibly. That is the OED hedging. Which means one of the most authoritative dictionaries on Earth looked at a word used professionally in film, theatre, and audio for a century and said "we think it might be short for go-between, but honestly, who knows."
This is delightful. A perfectly functional technical term with a perfectly uncertain origin. It just appeared on a film set in 1923 and nobody thought to write down why they called it that.
The Other Gobo (The Edible One)
There is a second gobo entirely. Gobo as a plant is the root of the greater burdock, Arctium lappa, cultivated for Japanese cooking. Completely unrelated word, completely unrelated thing.
The Japanese word gobō appears in a Portuguese-Japanese vocabulary from 1603. It shows up in Japanese text from 1181 or earlier. An English-Japanese vocabulary from 1830 translated it as "parsnip," which is close but not quite right.
The plant name traces back to a Middle Chinese compound meaning "ox burdock." Chinese regional variants confirm it: Southern Min has giû-pông, Cantonese has ngàuh bong, Mandarin has niúbàng. All variations on ox plus burdock.
So one gobo means shield. The other gobo means ox burdock. No connection. The OED lists them as noun¹ and noun². The vegetable got first billing.
Why Word Nerds Should Know This
Gobo is a good word to have in your back pocket for a few reasons.
First, it demonstrates that the same string of letters can land in completely different etymological territories. The technical gobo probably comes from go-between. The vegetable gobo comes from Chinese via Japanese via Portuguese documentation. They just happen to sound identical in English.
Second, gobo is perfectly legal in Scrabble and similar games. Four letters, common vowel-to-consonant ratio, two-syllable hook potential. Worth knowing.
Third, the etymology mystery is the kind of thing you can pull out at exactly the right moment. The word has been in professional use for over a hundred years and the best explanation anyone has managed is "perhaps."
Sometimes that is the most honest answer a word can give you.
Source: Languagehat