| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| b | |
| —symbol for | |
| chess See algebraic notation | |
| B | |
| —symbol for | |
| 1. | music |
| a. a note having a frequency of 493.88 hertz (B above middle C) or this value multiplied or divided by any power of 2; the seventh note of the scale of C major | |
| b. a key, string, or pipe producing this note | |
| c. the major or minor key having this note as its tonic | |
| 2. | the supporting or less important of two things: the B side of a record |
| 3. | a human blood type of the ABO group, containing the B antigen |
| 4. | (in Britain) a secondary road |
| 5. | the number 11 in hexadecimal notation |
| 6. | chem boron |
| 7. | magnetic flux density |
| 8. | chess bishop |
| 9. | Compare H (on Brit pencils, signifying degree of softness of lead) black: B; 2B; 3B |
| 10. | physics Also: b bel |
| 11. | physics baryon number |
| 12. | balboa |
| 13. | belga |
| 14. | bolivar |
| 15. | photog B-setting |
| 16. | a. a person whose job is in middle management, or who holds an intermediate administrative or professional position |
| b. See also occupation groupings (as modifier): a B worker | |
| —abbreviation for | |
| 17. | Belgium (international car registration) |
| b. | |
| —abbreviation for | |
| 1. | born |
| 2. | cricket bowled |
| B. | |
| —abbreviation for | |
| 1. | (on maps, etc) bay |
| 2. | British |
| B- | |
| —abbreviation for | |
| bomber: B-52 | |
b or B
abbr.
blood (used as a subscript)
B
The symbol for the element boron.
B
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| boron (bôr'ŏn') Pronunciation Key
Symbol 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. |
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