ultracold
adjective
ultracold is an adjective meaning “Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed” (English Wiktionary, September 2026). It is spelled U-L-T-R-A-C-O-L-D, and it appears about once in every 23 million words in written English (wordfreq, 2021 data).
What does ultracold mean?
adjective
- 1
Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed.
- 2
informalExtremely cold; of utmost coldness.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of ultracold
- more ultracold comparative
- most ultracold superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is ultracold?
Ultracold appears about once in every 23 million words in written English, the 146,811th 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).
Ultracold in Spanish, French, German and Portuguese
In the sense close to zero Kelvin:
| Language | Words |
|---|---|
| German | ultrakalt |
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 ultracold come from?
From ultra- + cold.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).