What is the longest word in Webster?

This is a bit of a trick question! There are a few ways to interpret "longest word" and there isn't a single definitive answer. Here's why:

* By letter count: The longest word in Webster's Dictionary by letter count is "pneumonoultramicroscopicsilicovolcanoconiosis", a lung disease caused by inhaling very fine silica dust. It has 45 letters.

* By syllable count: Some argue that "floccinaucinihilipilification", meaning "the act of estimating something as worthless," is the longest word with 29 letters and 8 syllables.

* Technically: Technically, the longest word in the dictionary is "antidisestablishmentarianism", which has 28 letters and 11 syllables.

Ultimately, the "longest word" depends on what criteria you're using to measure it.