What does "sealed system" mean?

Any device with inner workings obscured.

What is a synonym for "sealed system"?

Common synonyms include: closed-system, most closed system.

noun

noun ·Rare ·Advanced level

Noun

1
Any device with inner workings obscured.
"There are many types of sealed systems, for example an audio speaker, a printing machine, a heating system, or a grain storage system."

"There are many types of sealed systems, for example an audio speaker, a printing machine, a heating system, or a grain storage system."