- the second letter of the Greek alphabet (β, B).
- the consonant sound represented by this letter.
- (initial capital letter) Astronomy. a star that is usually the second brightest of a constellation: The second brightest star in Taurus is Beta Tauri.
- one of the possible positions of an atom or group in a compound.
- one of two or more isomeric compounds.
- the second of any series, as in chemistry or physics.
- Also called beta coefficient, beta line. Stock Exchange. an arbitrary measure of the volatility of a given stock using an index of the volatility of the market as a whole: A beta of 1.1 indicates a stock that is 10 percent more volatile than the market.
- (initial capital letter) Trademark. a brand of tape format for VCR tape, incompatible with other formats.Compare VHS.
- Chiefly British. a grade showing that a student is in the middle or second of three scholastic sections in a class.Compare alpha(def 7), gamma(def 9).
- the second letter in the Greek alphabet (Β, β), a consonant, transliterated as b
- the second highest grade or mark, as in an examination
- involving or relating to electronsbeta emitter
- relating to one of two or more allotropes or crystal structures of a solidbeta iron
- relating to one of two or more isomeric forms of a chemical compound
- (foll by the genitive case of a specified constellation) a star in a constellation, usually the second brightestBeta Persei
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.
- The second letter of the Greek alphabet.
- The second item in a series or system of classification.
- A beta particle.
- A beta ray.
- 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.