ultrafilter
noun, verb
ultrafilter is spelled U-L-T-R-A-F-I-L-T-E-R: 11 letters. It appears about once in every 71 million words in written English, the 265,644th most frequent word form (wordfreq, 2021 data). As a noun, ultrafilter means “A device that performs ultrafiltration” (English Wiktionary, September 2026). The plural of ultrafilter is ultrafilters.
How many letters and syllables are in ultrafilter?
| Letters | 11: U-L-T-R-A-F-I-L-T-E-R |
|---|---|
| In writing | about once in every 71 million words; the 265,644th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is ultrafilter?
Ultrafilter appears about once in every 71 million words in written English, the 265,644th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of ultrafilter
- ultrafilters plural, present, singular, he/she/it
- ultrafiltering participle, present
- ultrafiltered participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does ultrafilter mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A device that performs ultrafiltration.
- 2
A proper filter which has a law of dichotomy for complements.
A proper filter of a set has these three properties: (1) it does not contain the empty set, (2) if it contains a subset then it contains all supersets of that subset, and (3) if it contains a pair of subsets then it also contains their inte
- 3
A filter (subset of a poset) that is maximal as a set with respect to the definition of proper filter.
An ultrafilter is maximal in the sense that if any other element of the poset not already in it were added to it, one could deduce (from the laws which define the filter, and the given ordering relation, i.e., the structure of the poset) th
verb
- 1
To filter by ultrafiltration.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Ultrafilter in Spanish, French, German and Portuguese
In the sense Translations:
| Language | Words |
|---|---|
| French | ultrafiltre |
| German | Ultrafilter |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does ultrafilter come from?
From ultra- + filter.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).