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 21,470 “R” headwords), classed as a noun. The kind of spelling people second-guess.

#95,324
frequency rank, English
21,470
“R” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Alternative form of sirolimus.

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)

Where “rapamycin” sits in English frequency

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

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

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

rapamycin is uncommon English at frequency #95,324 among 21,470 “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.

Using “rapamycin”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is R-A-P-A-M-Y-C-I-N - every other letter order is a misspelling in standard orthography.
  • Say it as /ˌɹæp.əˈmaɪ.sɪn/ (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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list