Key features
- instant in-page word definitions
- English-to-English lookup for precise meanings
- works by selecting or clicking a word on any page
- no account or sign-up required
What Merriam-Webster Lookup does
Merriam-Webster Lookup lets you select a word on any webpage and get an English-to-English definition without leaving the page or opening a separate dictionary site. It's built for quick, in-context lookups rather than deep dictionary research, which makes it useful for reading unfamiliar text or building vocabulary while browsing.
Merriam-Webster Lookup free vs paid
The extension is free to install and use, with no listed premium tier or subscription. It's a single-purpose dictionary tool rather than a bundled suite, so you won't find upsells for translation or thesaurus features inside it.
Is Merriam-Webster Lookup safe?
To show definitions for the word you're viewing, the extension needs to read the content of the page you're on. That's standard for in-page lookup tools and is required for the core feature to work. It doesn't advertise account creation or data collection beyond what's needed to detect the selected word.