birthday suit

noun

"birthday-suit" is a 12-letter English headword indexed on PlainSpell.

The verdict

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

Unranked
below top-frequency English
13
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing.

Corpus desk

Index EN-birthday-suit · birthday suit · English

birthday suit · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MEGA 13 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "B" 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 birthday suit
PropertyValue
Headwordbirthday suit
LanguageEnglish
Part of speechNoun
Letters13
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “birthday suit” in English

birthday suitsits 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

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

Our edit-distance generator produced no likely misspellings for birthday suit, which points to an orthography that plays by predictable English rules. This entry stands alone in our confusable dataset, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: From the lack of clothes worn when one is born. The correct English form is birthday suit, spelled B-I-R-T-H-D-A-Y- -S-U-I-T.

Definition

  1. 1
    Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing.
  2. 2
    Used other than figuratively or idiomatically: see birthday, suit.

Recorded use

Wiktionary examples

These source excerpts show how birthday suit appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. George embarrassed his aunt by answering the door in his birthday suit.
  2. Nature, the universal tailor, provides for every other animal a birthday suit of clothes which is to outlast his life; but man, though so peculiarly sensitive to the assaults of the elements, is ushered into this nether sphere without any covering, in order that he may be compelled to exert his faculties, and become his own tailor, and thereby his own civ…

Etymology

From the lack of clothes worn when one is born.

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 "birthday suit"?
"birthday suit" is spelled B-I-R-T-H-D-A-Y- -S-U-I-T.
What does "birthday suit" mean?
As a noun, "birthday suit" means: Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing.
What is the origin of the word "birthday suit"?
From the lack of clothes worn when one is born. 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