STRATUS

Large dark low cloud (7)

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

• Quick crossword No 15,970 — 2021-07-13 23:00:00
  5D: Continuous horizontal grey cloud (7)
• Quick crossword No 15,525 — 2020-02-10 00:00:19
  1A: Large dark low cloud (7)