marsupium

noun

"marsupium" is a 9-letter English headword indexed on PlainSpell.

The verdict

“marsupium” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.

Unranked
below top-frequency English
9
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The external pouch in which female marsupials rear and feed the young.

Corpus desk

Index EN-marsupium · marsupium · English

marsupium · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "M" thin
  • PHOTO-UNK Peer pending

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.

Key facts for marsupium
PropertyValue
Headwordmarsupium
LanguageEnglish
Part of speechNoun
Letters9
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “marsupium” in English

marsupiumsits beyond the 100,000 most-frequent English words, in the long tail of technical, archaic, or otherwise rare vocabulary where spelling doubt tends to strike hardest.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

marsupium is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 2 senses are on record.

marsupium has no tracked misspelling variants, since its letter pattern doesn't lend itself to common typo substitutions. Our dataset records no confusable match here, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

Etymologically, the entry records: Borrowed from Latin marsūpium, from Ancient Greek μαρσίππιον (marsíppion), diminutive of μάρσιππος (mársippos, “pouch”), perhaps of Oriental origin. The correct English form is marsupium, spelled M-A-R-S-U-P-I-U-M.

Definition

  1. 1
    The external pouch in which female marsupials rear and feed the young.
  2. 2
    A brood pouch in some fishes, crustaceans and insects in the family Monophlebidae.

Etymology

Borrowed from Latin marsūpium, from Ancient Greek μαρσίππιον (marsíppion), diminutive of μάρσιππος (mársippos, “pouch”), perhaps of Oriental origin.

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). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "marsupium"?
"marsupium" is spelled M-A-R-S-U-P-I-U-M.
What does "marsupium" mean?
As a noun, "marsupium" means: The external pouch in which female marsupials rear and feed the young.
What is the origin of the word "marsupium"?
Borrowed from Latin marsūpium, from Ancient Greek μαρσίππιον (marsíppion), diminutive of μάρσιππος (mársippos, “pouch”), perhaps of Oriental origin. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list