sacrum
/ˈsækɹəm/
"sacrum" is a 6-letter English headword indexed on PlainSpell.
The verdict
“sacrum” is uncommon English (frequency #63,219 among 6,566 “S” headwords), classed as a noun. The kind of spelling people second-guess.
- #63,219
- frequency rank, English
- 6,566
- “S” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.
Corpus desk
Index EN-sacrum · sacrum · English
sacrum · rank #63,219 · 0 variants · 0 confusables
- FREQ-RARE #63,219
- LEN-LONG 6 letters
- VOW-2 2 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 6,566
- PHOTO-FINISH Sandys
Nearest frequency peer: Sandys (+2 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Long-tail ranks near “sacrum”
Sparse band: bars invert rank so rarer forms read shorter
- ruffin
ruffin
36,787 corpus weight
- Runcorn
Runcorn
36,786 corpus weight
- rupiah
rupiah
36,785 corpus weight
- sacrum
sacrum
36,782 corpus weight
- Sandys
Sandys
36,780 corpus weight
- sapping
sapping
36,778 corpus weight
What this shows Long-tail view: where “sacrum” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | sacrum |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈsækɹəm/ |
| Letters | 6 |
| Frequency rank | #63,219 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “sacrum” in English
Rare enough to double-check
sacrum is uncommon English at frequency #63,219 among 6,566 “S” headwords, classed as anoun, transcribed /ˈsækɹəm/. Rarity is why readers land here mid-draft. Gloss: "A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.".
Zero misspellings are on record for sacrum in our index, since its letter sequence doesn't invite the usual edit-distance slips. It is not paired with a close-neighbour confusable in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: From Latin os sacrum (“holy bone”), a calque of Ancient Greek ἱερὸν ὀστέον (hieròn ostéon). Apparently so called either because the sacrum was the part of the animal offered in sacrifice or because of a putative belief that it is where a person's soul resid… The correct English form is sacrum, spelled S-A-C-R-U-M.
Definition
- 1A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.
Etymology
From Latin os sacrum (“holy bone”), a calque of Ancient Greek ἱερὸν ὀστέον (hieròn ostéon). Apparently so called either because the sacrum was the part of the animal offered in sacrifice or because of a putative belief that it is where a person's soul resides. A third explanation is that the term is a translation of Ancient Greek ἱερόν (hierón), which has two meanings: “holy, sacred”, and “big” — big being a more appropriate description of the sacrum — but compare.
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
How do you spell "sacrum"?
What does "sacrum" mean?
How do you pronounce "sacrum"?
What is the origin of the word "sacrum"?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "sacrum", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 6 letters (nearest by frequency rank).