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bi-

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bi-¹

  • /baɪ-/
  • /bɪ-/ rare

Where it comes from

PIE word

*dwóh₁

Borrowed from Latin bi-, from Proto-Italic *dwi-, from Proto-Indo-European *dwi-. Doublet of twi- and di-.

prefix bin- · bis- · bir-

  1. morpheme Two in number. biarticular
  2. morpheme Having or possessing two of the root word's quality. biangular
  3. morpheme Both: referring to two as a set. biacetabular
  4. morpheme Being different in two ways with respect to the root. biadjoint
  5. morpheme Forked, divided by two, halved; (chemistry, proscribed) half bifurcate
  6. morpheme Double, twofold. bialgebroid
  7. morpheme Bisexual, relating to bisexuality. bicentric
  8. morpheme Bilateral, on both sides of the body. biconcave
  9. morpheme Twice. biannual
  10. morpheme Every two; a rate of once every two. biannual
  11. morpheme A pair of; composed of two. bibrow
  12. morpheme Used for the digit two to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name. un- (“1”) + bi- (“2”) + un- (“1”) + -ium (element suffix) → unbiunium (“element 121”)

    Similar: di-, duo-

bi-²

  • /baɪ-/
  • /bɪ-/ rare

Where it comes from

From Ancient Greek βίος (bíos, “life”).

prefix

  1. alternative, before vowel, morpheme Alternative form of bio- biont

Translations

Every language

prefix two-

Españolbi-, bis-, biz-
日本語双 sō
中文雙 /双 shuāng
हिन्दीद्वि- dvi-
Portuguêsbi-
Françaisbi-
Deutschbi-, zwei-
Italianobi-
Ελληνικάδι- di-
Русскийдвух- dvux-, дву- dvu-, би- bi-
עבריתדו־

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Cite this
MLA

"bi-." Wiktionary, via Micwyn, micwyn.com/word/bi-. Accessed 6 Nov. 2026.

APA

bi-. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/bi-

Chicago

"bi-." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/bi-.

BibTeX
@misc{bi_2026,
  title = {bi-},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/bi-},
  urldate = {2026-11-06}
}