blastocyst
/ˈblæstəsɪst/
"blastocyst" is a 10-letter English headword indexed on PlainSpell.
The verdict
“blastocyst” is uncommon English (frequency #93,474 among 31,241 “B” headwords), classed as a noun. The kind of spelling people second-guess.
- #93,474
- frequency rank, English
- 31,241
- “B” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The mammalian blastula.
| Property | Value |
|---|---|
| Headword | blastocyst |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈblæstəsɪst/ |
| Letters | 10 |
| Frequency rank | #93,474 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “blastocyst” sits in English frequency
Rare enough to double-check
blastocyst is uncommon English at frequency #93,474 among 31,241 “B” headwords, classed as anoun, transcribed /ˈblæstəsɪst/. Rarity is why readers land here mid-draft. Gloss: "The mammalian blastula.".
Our edit-distance generator produced no likely misspellings for blastocyst, and the word's spelling is regular enough that our generator found nothing worth flagging. Our dataset records no confusable match here, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Etymologically, the entry records: From blasto- + cyst. The correct English form is blastocyst, spelled B-L-A-S-T-O-C-Y-S-T.
Definition
- 1The mammalian blastula.
Etymology
From blasto- + cyst.
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “blastocyst”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is B-L-A-S-T-O-C-Y-S-T - every other letter order is a misspelling in standard orthography.
- Say it as /ˈblæstəsɪst/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
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.