A History of Short Words

From the New York Times Crossword Puzzle

HYDRA

Fri, 11 Jul '25
Sea serpent of myth
Fri, 23 May '25
Monster slain in one of Hercules' 12 labors
Tue, 13 May '25
Many-headed monster of myth
Fri, 9 Sep '22
Many-headed monster
Sat, 20 Aug '22
Enemy organization in Marvel Comics
Sat, 9 Jan '21
Sea serpent in the night sky