A History of Short Words

From the New York Times Crossword Puzzle

ICU

Thu, 25 Nov '21
Location for round-the-clock monitoring, in brief
Sat, 3 Jul '21
Where cc's are seen
Thu, 20 May '21
Post-op stop
Sun, 2 May '21
Post-O.R. destination, often
Sat, 1 May '21
Frequent setting on "Chicago Med"
Sat, 20 Mar '21
Critical area, for short