[ bahy ]
/ baɪ /
adjective, noun, plural bis, bi's.
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Question 1 of 10
Origin of bi
Definition for bi (2 of 5)
Definition for bi (3 of 5)
Definition for bi (4 of 5)
a combining form meaning “twice,” “two,” used in the formation of compound words: bifacial; bifarious.
Origin of bi-1
<Latin, combining form of bis;see twice
words often confused with bi-
All words except biennial referring to periods of time and prefixed by bi-1 are potentially ambiguous. Since bi- can be taken to mean either “twice each” or “every two,” a word like biweekly can be understood as “twice each week” or “every two weeks.” To avoid confusion, it is better to use the prefix semi- to mean “twice each” ( semiannual; semimonthly; semiweekly ) or the phrase twice a or twice each ( twice a month; twice a week; twice each year ), and for the other sense to use the phrase every two ( every two months; every two weeks; every two years ).
Definition for bi (5 of 5)
variant of bio-, especially before a vowel: biopsy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for bi (1 of 5)
British Dictionary definitions for bi (2 of 5)
the internet domain name for
British Dictionary definitions for bi (3 of 5)
the chemical symbol for
British Dictionary definitions for bi (4 of 5)
sometimes before a vowel bin-
two; having twobifocal
occurring every two; lasting for twobiennial
on both sides, surfaces, directions, etcbilateral
occurring twice duringbiweekly
- denoting an organic compound containing two identical cyclic hydrocarbon systemsbiphenyl
- (rare in technical usage) indicating an acid salt of a dibasic acidsodium bicarbonate
- (not in technical usage) equivalent of di- 1 (def. 2a)
Word Origin for bi-
from Latin, from bis twice
British Dictionary definitions for bi (5 of 5)
a variant of bio-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for bi (1 of 3)
Medical definitions for bi (2 of 3)
Both sides, parts, or directions:biconcave.
Containing twice the proportion of a specified chemical element or group necessary for stability:bicarbonate.
Containing two chemical atoms, radicals, or groups:biphenyl.
Medical definitions for bi (3 of 3)
The symbol for the elementbismuth
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for bi
The symbol for bismuth.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.