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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 Greek letter beta. Entries beginning with this character are alphabetized under beta.
beta be·ta (bā'tə, bē'-)
Symbol β 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.