Meaning of GAMMA in English

[noun] [C] - the third letter of the Greek alphabet, sometimes given as a mark for a student's work to show satisfactory qualityCompare alpha; beta.Gamma globulin is a natural substance in the blood that gives protection against disease.Gamma globulin injections are often used as a way of protecting you against certain diseases, esp. when travelling abroad.Gamma radiation is a type of electromagnetic radiation of very short wave length, often produced in radioactive decay, which goes through most solid objects.

Cambridge English vocab.      Кембриджский английский словарь.