FES

noun

FES is a noun meaning “Initialism of floppy eyelid syndrome” (English Wiktionary, September 2026). It is spelled F-E-S, and it appears about once in every 2 million words in written English (wordfreq, 2021 data).

What does FES mean?

noun

1
Initialism of floppy eyelid syndrome
2
Initialism of fat embolism syndrome.

noun

as Fes

1
plural of Fe (a form of Fe)

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

How common is FES?

FES appears about once in every 2 million words in written English, the 39,832nd most frequent word form in the list.

FES0.0010.010.11101001,00010,000

rarerper million words of written Englishmore common

Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).