1. A spectral line formed by more than two (seedoublet) closely spaced lines.
2. A group of elementary particles that are identical in all respects except electric charge and strangeness.
Astronomy
A group of closely spaced spectral lines formed by the same element or ion, caused when electrons with different directions of spin jump from a common lower energy level. See alsoFine Structure.
Chemistry
1. A spectral line formed by more than two (seedoublet) closely spaced lines.
2. A group of elementary particles that are identical in all respects except that of electric charge and strangeness.