Definition of "bi-" in English

prefix

1. Two in number.

   • biarticular
   • biaxial
   • bicoloured

2. Having or possessing two of the root word's quality.

   • biangular
   • biantheriferous
   • bicardial
   • bikont

3. Both: referring to two as a set.

   • biacetabular
   • biallelic
   • bicaval

4. Being different in two ways with respect to the root.

   • biadjoint
   • biaffine
   • biclonal

5. Forked, divided by two, halved; (chemistry, proscribed) half

   • bifurcate
   • bicapitate
   • bicarinate

6. Double, twofold.

   • bialgebroid
   • bifarious
   • biarticulated

7. (LGBTQ) Bisexual, relating to bisexuality.

   • bicentric
   • biphobia
   • biromantic

8. (anatomy) Bilateral, on both sides of the body.

   • biconcave
   • biballism

9. Twice.

   • biannual
   • biannual
   • biconjugate

10. Every two; a rate of once every two.

    • biannual
    • bicentennial

11. A pair of; composed of two.

    • bibrow
    • bicomplex

12. (chemistry) 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”)

prefix

1. (before a vowel) Alternative form of bio-.

   • biont