Why is motherboard called motherboard?

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2. #hence
3. #called
4. #different
5. #plugging
6. #other
7. #terminology
8. #suggests
9. #mainboard
10. #computer
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12. #boards
13. #daughter
14. #historically
15. #wikipedia
16. #extensible
17. #board
18. #circuit
19. #motherboard
20. #extensions
21. #these