multiplet

1. A spectral line having more than one component, representing slight variations in the energy states characteristic of an atom.
2. Any of several classes or groupings of subatomic particles, such as the nucleon, that are similar in most properties but different in electric charge.

[MULTIPL(E) + (DOUBL)ET.]

1. A spectral line formed by more than two (see doublet) closely spaced lines. 2. A group of elementary particles that are identical in all respects except that of electric charge.