power tool
A tool that receives power other than from one's hands to operate, typically electricity. Make sure you keep your power tools locked up and out of sight of the children. If you're looking for something to get your aunt for Christmas, you can never go wrong with a good power tool. I think she's been eyeing up a new belt sander.
power tool
n. a student who studies most of the time. (An elaboration of tool.) Willard is a power tool if there ever was one. Studies most of the night.