ultrastructure
noun
ultrastructure is a noun meaning “The fine, detailed structure of a biological specimen that can only be observed by electron microscopy” (English Wiktionary, September 2026). It is spelled U-L-T-R-A-S-T-R-U-C-T-U-R-E, and it appears about once in every 18 million words in written English (wordfreq, 2021 data). The plural of ultrastructure is ultrastructures.
What does ultrastructure mean?
noun
- 1
The fine, detailed structure of a biological specimen that can only be observed by electron microscopy
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of ultrastructure
- ultrastructures plural
- ultra-structure
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is ultrastructure?
Ultrastructure appears about once in every 18 million words in written English, the 127,184th 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).
Ultrastructure in Spanish, French, German and Portuguese
In the sense detailed structure observable only by electron microscopy:
| Language | Words |
|---|---|
| German | Ultrastruktur |
| Spanish | ultraestructura |
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 ultrastructure come from?
From ultra- + structure.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).