multiplet

/M AH1 L T IY0 P L AH0 T/
noun
  1. 1

    A spectral line that has multiple components.

  2. 2

    A compound peak produced in several forms of spectroscopy.

  3. 3

    Any of several groupings of subatomic particles that share most properties, but have different charges.

Source: https://en.wiktionary.org/wiki/multiplet