half width at half maximum

synonym: half width at half height (HWHH)
initialism: HWHM
https://doi.org/10.1351/goldbook.08254
One half of the full width at half maximum.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 661 [Terms] [Paper]