noun, plural giz·mos.

  1. gismo.

noun, plural gis·mos. Informal.

  1. a gadget or device: What is this gismo supposed to do?

noun plural -mos

  1. slang a device; gadget

1942, “Marine and Navy usage for any old thing you can’t put a name to” [“Life” magazine, July 30, 1945], of unknown origin, perhaps a made-up word.

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