| Answer | Crossword Clue |
|---|---|
| phosphoroscopes | PHOSPHOROSCOPE, an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed |
| Answer | Crossword Clue |
|---|---|
| phosphoroscopes | PHOSPHOROSCOPE, an instrument for measuring the duration of phosphorescence after the source of radiation causing it has been removed |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.