longest word

is not in our dictionary (yet). Here's what it could mean:

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noun

A term referring to the word in a language that has the most letters; in English, often cited as *pneumonoultramicroscopicsilicovolcanoconiosis*, a type of lung disease.

Example Sentences

Examples are provided to illustrate usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

For every four you complete, you’ll unlock a new pair of letters to use with your existing set—and you have just one shot to find the longest word you can make with them.

From Slate ● Aug. 5, 2026

Pneumonoultramicroscopicsilicovolcanoconiosis is generally understood to be the longest word in the English language, with 45 letters.

From Fox News ● Oct. 16, 2021

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other words

spelling bee nightmare
polysyllabic term
sesquipedalian word
dictionary-breaker

Possible Antonyms

basic vocabulary
A-B-C
easy-peasy word
monosyllable
one-letter wonder