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From bread + board.
Regarding definition 3: the etymology is either that electric circuits used to be prototyped on actual bread boards (definition 1) populated with nails, or that solder breadboards have lots of holes and are usually brown (they visually resemble a slice of bread), or a merging of the two. The etymology is less obvious today given the popularity of solderless breadboards.
2011 August 2, Keith Brindley, Starting Electronics, page 18:
If you are following a book like Starting Electronics, however, a breadboard is even more useful. […] Differences lie between breadboards in the spacings and the positionings of the holes, and the number of holes in each group.
1990, Delton T. Horn, 49 electronic 6-volt projects, page 9:
If the breadboarded circuit operates incorrectly or erratically, try relocating some of the components.
1998, Jim Williams, The Art and Science of Analog Circuit Design, page 114:
There are many commercial breadboarding systems, but almost all of them are designed to facilitate the breadboarding of digital systems, where noise immunities are hundreds of millivolts or more.