A History of Short Words

From the New York Times Crossword Puzzle

GAMMA

Thu, 26 Sep '24
This letter: ?
Fri, 21 Jul '23
Like electromagnetic radiation with the shortest wavelength
Thu, 16 Mar '23
Kind of ray
Fri, 2 Dec '22
Delta follows it
Sat, 5 Jun '21
Third-tier caste member in "Brave New World"