Definition of B:

• aerobic rod- shaped spore- producing bacterium; often occurring in chainlike formations; found primarily in soil
• the 2nd letter of the Roman alphabet
• ( physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter
• is the second letter of the English alphabet. ( See Guide to Pronunciation, 196, 220.) It is etymologically related to p, v, f, w and m , letters representing sounds having a close organic affinity to its own sound; as in Eng. bursar and purser; Eng.
• Abbreviation for base. Chemical symbol of boron.
• Second letter of the alphabet.
• Is the second letter, and the first consonant in the English as well as most other alphabets. It is a mute and a labial, being formed by pressing the whole length of the lips together, and forcing them open with a strong breath. It has a near affinity with the labial letters P and V. and in some languages is interchanged with them.
• As an abbreviation in writing, generally stands for bachelor, as B. A., bachelor of arts. In B. C., it stands for before. Not to know a B from a bull's foot, to be extremely ignorant.
• As a numeral, was used by the Hebrews and Greeks, as now by the Arabians, for 2, by the Romans for 300, and with a dash over it, thus, B for 3, 000.
• In music, is the designation of the seventh note in the natural diatonic scale of C; it also stands for base, and B. C. for basso continue, or thorough base.
• Name of a musical sound.
• is the second letter of the English alphabet. See Guide to Pronunciation, // 196, 220. It is etymologically related to p, v, f, w and m , letters representing sounds having a close organic affinity to its own sound; as in Eng. bursar and purser; Eng. bear and Lat. ferre; Eng. silver and Ger. silber; Lat. cubitum and It. gomito; Eng. seven, Anglo-Saxon seofon, Ger. sieben, Lat. septem, Gr." epta`, Sanskrit saptan. The form of letter B is Roman, from Greek B Beta, of Semitic origin. The small b was formed by gradual change from the capital B.
• The second letter of the English alphabet : is used to denote the second of a series of pages, notes, etc.; the subsequent letters, the third and following numbers.
• the blood group whose red cells carry the B antigen
• The second letter in the English alphabet.

Usage examples for B

1. Women were always too profound for Mr. B. B. Boylan-" " Sorry.  Red Fleece by Will Levington Comfort

2. Of course they went to Dr. B. 's.  Strange True Stories of Louisiana by George Washington Cable

3. That's the letter B. Now tell me, sir, directly, what that letter is.  Mr. Midshipman Easy by Captain Frederick Marryat

4. No A is B. .  Deductive Logic by St. George Stock