protoporphyrin
noun
protoporphyrin is spelled P-R-O-T-O-P-O-R-P-H-Y-R-I-N: 14 letters. It appears about once in every 40 million words in written English, the 194,306th most frequent word form (wordfreq, 2021 data). As a noun, protoporphyrin means “Any porphyrin that lacks a central metal ion” (English Wiktionary, September 2026). The plural of protoporphyrin is protoporphyrins.
How many letters and syllables are in protoporphyrin?
| Letters | 14: P-R-O-T-O-P-O-R-P-H-Y-R-I-N |
|---|---|
| In writing | about once in every 40 million words; the 194,306th 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 protoporphyrin?
Protoporphyrin appears about once in every 40 million words in written English, the 194,306th 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 protoporphyrin
- protoporphyrins plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does protoporphyrin mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Any porphyrin that lacks a central metal ion
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does protoporphyrin come from?
From proto- + porphyrin.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).