A device that "scans" words in a book isn't familiar to me. But what I usually do with finding word definitions while I'm reading a book is similar to kindlekitten's. There's a Merriam-Webster app in my phone so I use that; typing the words and looking over the meaning that appears.
I wish for an ebook-reader with "synonym" features where you can double click the word and a synonym/word meaning appears.
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