B, b

[ bee ]
/ bi /
|

noun, plural B's or Bs, b's or bs.

the second letter of the English alphabet, a consonant.
any spoken sound represented by the letter B or b, as in bid, bauble, or daubed.
something having the shape of a B.
a written or printed representation of the letter B or b.
a device, as a printer's type, for reproducing the letter B or b.

Definition for b (2 of 8)

b


Physics.
  1. bar; bars.
  2. barn; barns.

Definition for b (3 of 8)

B


Chess. bishop.
Photography. bulb(def 8).

Definition for b (4 of 8)

B


Symbol.

Definition for b (5 of 8)

B-


U.S. Military.

(in designations of aircraft) bomber: B-29.

Definition for b (6 of 8)

b.


Definition for b (7 of 8)

Definition for b (8 of 8)

beta

[ bey-tuh or, esp. British, bee- ]
/ ˈbeɪ tə or, esp. British, ˈbi- /

noun

Origin of beta

< Latin < Greek bêta < Semitic; compare Hebrew bēth beth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for b

British Dictionary definitions for b (1 of 8)

b


symbol for

British Dictionary definitions for b (2 of 8)

b

B

/ (biː) /

noun plural b's, B's or Bs

the second letter and first consonant of the modern English alphabet
a speech sound represented by this letter, usually a voiced bilabial stop, as in bell
Also: beta the second in a series, esp the second highest grade in an examination

British Dictionary definitions for b (3 of 8)

B


symbol for

abbreviation for

Belgium (international car registration)

British Dictionary definitions for b (4 of 8)

B-


abbreviation for (of US military aircraft)

bomberB-52

British Dictionary definitions for b (5 of 8)

b.


abbreviation for

born
cricket bowled

British Dictionary definitions for b (6 of 8)

B.


abbreviation for

(on maps, etc) bay
British

British Dictionary definitions for b (7 of 8)

beta

/ (ˈbiːtə) /

noun

the second letter in the Greek alphabet (Β, β), a consonant, transliterated as b
the second highest grade or mark, as in an examination
(modifier)
  1. involving or relating to electronsbeta emitter
  2. relating to one of two or more allotropes or crystal structures of a solidbeta iron
  3. relating to one of two or more isomeric forms of a chemical compound

Word Origin for beta

from Greek bēta, from Hebrew; see beth

British Dictionary definitions for b (8 of 8)

Beta

/ (ˈbiːtə) /

noun

(foll by the genitive case of a specified constellation) a star in a constellation, usually the second brightestBeta Persei
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

Word Origin and History for b

beta


n.

second letter of the Greek alphabet, c.1300, from Greek, from Hebrew/Phoenician beth (see alphabet); used to designate the second of many things. Beta radiation is from 1899 (Rutherford). Beta particle is attested from 1904.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for b (1 of 3)

b


abbr.

blood (used as a subscript)

Medicine definitions for b (2 of 3)

B


The symbol for the elementboron

Medicine definitions for b (3 of 3)

beta

[ bātə, bē- ]

n.

The second letter of the Greek alphabet.
The second item in a series or system of classification.
A beta particle.
A beta ray.

adj.

Of or relating to the second position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.
Of or relating to an isomeric variation of a chemical compound, such as a stereoisomer.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for b (1 of 2)

B


The symbol for boron.
The symbol for magnetic field.

Science definitions for b (2 of 2)

boron

[ bôrŏn′ ]

B

A shiny, brittle, black metalloid element extracted chiefly from borax. It is a good electrical conductor at high temperatures and a poor conductor at low temperatures. Boron is necessary for the growth of land plants and is used in the preparation of soaps, abrasives, and hard alloys. It is also used in the control rods of nuclear reactors as a neutron absorber. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.