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The motherboard is the big main board inside a computer. Almost everything important sits on it or plugs into it: the chip that thinks, the memory, the sockets for the screen, the keyboard, the storage. Smaller boards can plug into it; those are sometimes called daughterboards. “Mother” here does not mean a person. It means the main board the others belong to — the one that holds the machine together. The compound has been used since about 1965. It is ordinary tech talk, not slang.
主機板（中國大陸較常說「主板」；臺灣買零件時看「主機板」）
組成Compound of mother + board, attested since 1965. Mother here means “the main one, the one the others attach to.” Board is the flat circuit board.
同家族的字
- boardthe flat piece that electronic parts sit on
- daughterboarda smaller board that plugs into the motherboard
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
motherboardnoun/ˈmʌðɚˌbɔɹd/
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computer-hardwarecomputingengineeringThe primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices.
- An electronics shop was selling ugly refurbished computers. They were small black and grey things with exposed motherboards and cracked cases.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。