bi
1 of 4noun or adjective
ˈbī 
: bisexual
bi-
2 of 4prefix
1
a
: two
bilateral
b
: coming or occurring every two
bicentennial
c
: into two parts
bisect
2
a
: twice : doubly : on both sides
biconvex
b
: coming or occurring two times
biannual
compare semi- 3
: between, involving, or affecting two (specified) symmetrical parts
bilabial
4
a
: containing one (specified) constituent in double the proportion of the other constituent or in double the ordinary proportion
bicarbonate
b
: di- sense 2
biphenyl
bi-
3 of 4combining form
variants or bio-
1
: life : living organisms or tissue
bioluminescence
biosphere
2
: biographical
biopic
Bi
4 of 4symbol
bismuth
Word History
Etymology
Prefix
Middle English, from Latin — more at twi-
Combining form
Greek, from bios mode of life — more at quick entry 1
First Known Use
Noun Or Adjective
1956, in the meaning defined above
Phrases Containing bi
Kids Definition
bi-
prefix
1
: two
biped
2
: coming or occurring every two
biennial
3
: into two parts
bisect
4
: twice : doubly : on both sides
Medical Definition
Bi
symbol
bismuth