About electronic parts that are extremely small — the tiny circuits inside a chip, not a big old radio with wires you can see. A microelectronic device is one built from those tiny parts. You will see the word in science, factories, and product lists (microelectronic components). It is a technical adjective; ordinary people more often just say chip or electronics. As a noun, a microelectronic can mean one of those tiny devices, though that use is less common than the adjective. If you need the name of the whole field or industry, that is microelectronics, with an -s. Taiwan’s chip factories are a large real-world home for both words.

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