blood serum
"blood-serum" is a 10-letter English headword indexed on PlainSpell.
The verdict
“blood serum” is outside the top-ranked English vocabulary, used as a noun - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 11
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The portion of whole blood that is not blood cells and not clotting factors; it can be separated as a clear yellowish liquid after the blood has been allowed to clot.
| Property | Value |
|---|---|
| Headword | blood serum |
| Language | English |
| Part of speech | Noun |
| Letters | 11 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “blood serum” sits in English frequency
Spelling & Dictionary Insight
The English entry for blood serum is 11 letters long, classified as a noun. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "The portion of whole blood that is not blood cells and not clotting factors; it can be separated as a clear yellowish liquid after the blood has been allowed to clot.".
The misspelling generator found no plausible variants for blood serum, suggesting the orthography follows predictable English patterns. Our confusable-pair dataset has no match for it, which typically means the spelling is too distinctive to be mistaken for another word.
Wiktionary doesn't record an etymology for this headword, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct English form is blood serum, spelled B-L-O-O-D- -S-E-R-U-M.
Definition
- 1The portion of whole blood that is not blood cells and not clotting factors; it can be separated as a clear yellowish liquid after the blood has been allowed to clot.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “blood serum”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is B-L-O-O-D- -S-E-R-U-M - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.