Englishfor English speakers
reactor
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noun
an electrical device used to introduce reactance into a circuit
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noun
(= nuclear reactor)
(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
floor
Noun
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The floor is the flat part at the bottom of a room. People stand on the floor.
Don't drop your milk on the floor.
The children are sitting on the floor to play.
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A floor is a level of a building.
To get to room 302 you have to go up three floors.