CUBEROOT

4 of 64 or 5 of 125, for example (4,4)

Solution has appeared in 2 crosswords (2 across and 0 down):

• Quick crossword No 15,631 — 2020-06-11 23:00:05
  17A: <span>The 'x' in x</span>³ (4,4)
• Quick crossword No 15,376 — 2019-08-18 23:00:25
  10A: 4 of 64 or 5 of 125, for example (4,4)