line width

https://doi.org/10.1351/goldbook.L03567
Width of a spectral line in terms of @W06659@, @F02525@ or @W06664@. Usually defined as full or half width of the line at half of the maximum intensity @F02565@ or @H02873@, respectively).
Source:
Green Book, 2nd ed., p. 31 [Terms] [Book]