rapamycin

/ˌɹæp.əˈmaɪ.sɪn/

//ˌɹæp.əˈmaɪ.sɪn// noun

By · According to Wiktionary data (CC BY-SA) ·

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

The verdict

“rapamycin” is uncommon English (frequency #95,324 among 3,094 “R” headwords), classed as a noun. The kind of spelling people second-guess.

#95,324
frequency rank, English
3,094
“R” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Alternative form of sirolimus.

Corpus desk

Index EN-rapamycin · rapamycin · English

rapamycin · rank #95,324 · 0 variants · 0 confusables

  • FREQ-RARE #95,324
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 3,094
  • PHOTO-FINISH Rati

Nearest frequency peer: Rati (+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 “rapamycin”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “rapamycin” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for rapamycin
PropertyValue
Headwordrapamycin
LanguageEnglish
Part of speechNoun
IPA/ˌɹæp.əˈmaɪ.sɪn/
Letters9
Frequency rank#95,324
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “rapamycin” in English

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).rapamycinfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “Rati” (#95,326), “Raikes” (#95,321), “reaver” (#95,329). Among 3,094 “R” headwords, “rapamycin” is #95,324. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

rapamycin is uncommon English at frequency #95,324 among 3,094 “R” headwords, classed as anoun, transcribed /ˌɹæp.əˈmaɪ.sɪn/. Rarity is why readers land here mid-draft. Gloss: "Alternative form of sirolimus.".

No generated misspelling entries exist for rapamycin in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. Our dataset records no confusable match here, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From Rapa Nui Rapa (Nui) (“Easter Island”) + -mycin. The correct English form is rapamycin, spelled R-A-P-A-M-Y-C-I-N.

Definition

  1. 1
    Alternative form of sirolimus.

Etymology

From Rapa Nui Rapa (Nui) (“Easter Island”) + -mycin.

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 "rapamycin"?
"rapamycin" is spelled R-A-P-A-M-Y-C-I-N. The IPA pronunciation is /ˌɹæp.əˈmaɪ.sɪn/.
What does "rapamycin" mean?
As a noun, "rapamycin" means: Alternative form of sirolimus.
How do you pronounce "rapamycin"?
The IPA (International Phonetic Alphabet) transcription for "rapamycin" is /ˌɹæp.əˈmaɪ.sɪn/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "rapamycin"?
From Rapa Nui Rapa (Nui) (“Easter Island”) + -mycin. 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "rapamycin", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

recoiling#95,331pupillary#95,310repayable#95,339pronghorn#95,301

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

Source: FrequencyWords open word-frequency list