Look up any word without leaving the page.

Gloss is a free, open-source Chrome extension. Right-click a word or phrase and its definition opens beside it, slang included.

Notes in the margin

A scribe would write a , a short note in the margin, beside any word a reader might trip on. Today that word is as likely to be or as . The fix still holds: the meaning belongs beside the word, not in another tab.

Most of us still do it the slow way. We copy the word, open a new tab, search, skim a few results and come back having lost our place. Do that for every unfamiliar term in a long read and the tab bar fills up long before the article ends.

Glosses solved this a thousand years ago by keeping the explanation within reach of the eye. A good definition should arrive the same way: next to the word, sized to the moment, and gone when you are done with it.

That is the whole idea behind a margin note. It does not ask you to stop reading. It waits beside the line until you need it, answers the one question you had, and lets the page carry on as if nothing happened.

aura farming
noun
The act of cultivating an appearance or aesthetic of effortless, nonchalant charisma.
verb
present participle and gerund of aura farm
via Wiktionary
Try it here. Click any dotted word. The cards use Gloss’s own markup, with the definitions Wiktionary returns.

How it works

No new tab. No copy and paste.

Sources

It knows aura farming, clanker and unc.

Gloss asks Wiktionary first. Wiktionary is written by its readers, so this year’s slang sits right next to words like sesquipedalian. When Wiktionary has no entry, Gloss asks the Free Dictionary API instead.

  • Noun

    The act of cultivating an appearance or aesthetic of effortless, nonchalant charisma.

  • Noun

    A robot or artificial intelligence.

  • Adjective

    Old; no longer versed in or relevant to current youth culture.

  • Noun

    An instance of being uncontrollably angry or upset.

  • Noun

    Low-quality content produced by generative artificial intelligence, often characterized by hallucinations or a failure to meet the expectations of coherence and relevance.

Definitions from Wiktionary, shared under CC BY-SA 4.0. Click a word to open its full card.

Themes

Seven themes, each in light and dark.

Pick one in Settings. It applies to the toolbar popup and to every card, on every page.

aura farming
noun
The act of cultivating an appearance or aesthetic of effortless, nonchalant charisma.
via Wiktionary
aura farming
noun
The act of cultivating an appearance or aesthetic of effortless, nonchalant charisma.
via Wiktionary
Creative. Lavender on plum. The default.
clanker
noun
Something that makes a clanking noise.
via Wiktionary
clanker
noun
Something that makes a clanking noise.
via Wiktionary
Social. Coral, with a cyan accent.
sesquipedalian
adjective
Long; polysyllabic.
The most common use of "antidisestablishmentarianism" is as an example of a sesquipedalian word.
via Wiktionary
sesquipedalian
adjective
Long; polysyllabic.
The most common use of "antidisestablishmentarianism" is as an example of a sesquipedalian word.
via Wiktionary
Luxury. Gold on espresso.
ephemeral
adjective
Lasting for a short period of time.
via Wiktionary
ephemeral
adjective
Lasting for a short period of time.
via Wiktionary
Wellness. Sage green and cream.
vibe coding
noun
A method of programming in which a developer generates code by repeatedly prompting a large language model, while having a very limited awareness of how the code actually functions.
via Wiktionary
vibe coding
noun
A method of programming in which a developer generates code by repeatedly prompting a large language model, while having a very limited awareness of how the code actually functions.
via Wiktionary
Dashboard. Periwinkle on graphite.
AI slop
noun
Low-quality content produced by generative artificial intelligence, often characterized by hallucinations or a failure to meet the expectations of coherence and relevance.
via Wiktionary
AI slop
noun
Low-quality content produced by generative artificial intelligence, often characterized by hallucinations or a failure to meet the expectations of coherence and relevance.
via Wiktionary
Finance. Steel blue, kept quiet.
unc
adjective
Old; no longer versed in or relevant to current youth culture.
via Wiktionary
unc
adjective
Old; no longer versed in or relevant to current youth culture.
via Wiktionary
Fitness. Lime on black.

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Word bank

Keep the words you look up.

Press Save on a card and the word goes into your word bank, definitions included. Open Gloss from the toolbar to search it, read a word again, or swipe it away.

Try it: press Save on the card at the top of the page and the word lands in this list.

Privacy

The only thing that leaves your browser is the word.

No account, no analytics and no server of its own. Here is every permission Gloss asks Chrome for, and what it does with each one.

Right-click menucontextMenus
Adds Define with Gloss to the menu you get when you right-click selected text.
Storagestorage
Keeps your word bank, your settings and a seven-day cache of definitions on this computer.
Active tab and scriptingactiveTabscripting
Lets the card open in tabs that were already open before you installed Gloss.
All websites<all_urls>
Lets the card appear on any page, inside embedded frames too. Gloss reads the text you select and nothing else on the page.
Two dictionary sitesen.wiktionary.orgapi.dictionaryapi.dev
The only places Gloss sends anything: the word you looked up, with no cookies attached.

Open source

Read every line before you install it.

Plain JavaScript on Manifest V3. No framework and no build step, so what you read on GitHub is exactly what runs in your browser. MIT licensed.

$ git clone https://github.com/InsaneX-Dev/Gloss.git
  1. Download the zip from the latest release and unzip it, or clone the repo.
  2. Open chrome://extensions and switch on Developer mode.
  3. Click Load unpacked and choose the unzipped Gloss folder.
1,521
lines of JavaScript, in four files
0
dependencies to install, audit or keep updated
10
source files in the whole extension

Questions

Before you install

Does it work offline?

Words you looked up in the last seven days are cached, so they open without a connection. New words need one.

Can I look up phrases?

Yes. Select anything up to 50 characters, like aura farming or crash out. If neither Wiktionary nor the Free Dictionary has an entry, the card tells you.

Do saved words sync between computers?

No. They stay in Chrome’s local storage on the computer where you saved them, and removing Gloss deletes them.

Can I define a word with a double-click?

Yes. Click the Gloss icon in the toolbar, open Settings and turn on Double-click to define. It starts off, so selecting text to read along works as usual until you want it.

Next time a word stops you, right-click it.

Download for Chrome