OXYGEN

Gas, O (6)

Solution has appeared in 3 crosswords (2 across and 1 down):

• Quick crossword No 16,548 — 2023-05-19 23:00:40
  14A: Gas, O (6)
• Quick crossword No 16,107 — 2021-12-21 00:00:02
  4D: Gas making up over 20% of Earth's atmosphere (6)
• Quick crossword No 15,963 — 2021-07-05 23:00:11
  13A: Gas, O (6)