Illustrated Glossary of Organic Chemistry

Multiplet: An NMR signal that is split, but is too complex to interpret easily. This might arise from non-first-order splitting, or two or more overlapping signals.

In the ¹H-NMR spectrum of 2-ethylphenol, the CH₃ signal is a triplet, the CH₂ signal is a quartet, the OH signal is a singlet, and the benzene ring protons signal is a multiplet. Click the image to see a larger version.