A kitchen appliance was a tool or technology used in the kitchen.
In 2154, Trip Tucker offered to fix T'Les's malfunctioning stasis unit, saying that if he could re-calibrate a warp reactor, a kitchen appliance ought to be a cinch. (ENT: "Home")
Later that year, Tucker recalled his folks putting all the kitchen appliances on the highest shelves when he was a child so that he couldn't reach them and disassemble them. (ENT: "Observer Effect")