Etymology
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gizmo (n.)

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. Compare gadget, thingamajig.

updated on March 08, 2015

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Definitions of gizmo from WordNet

gizmo (n.)
something unspecified whose name is either forgotten or not known;
there may be some great new gizmo around the corner that you will want to use
Synonyms: doodad / doohickey / doojigger / gimmick / gismo / gubbins / thingamabob / thingumabob / thingmabob / thingamajig / thingumajig / thingmajig / thingummy / whatchamacallit / whatchamacallum / whatsis / widget
gizmo (n.)
a device or control that is very useful for a particular job;
From wordnet.princeton.edu, not affiliated with etymonline.