| Answer | Crossword Clue |
|---|---|
| phototubes | A photocell in the form of an electron tube with a photoemissive cathode |
| phototubes | PHOTOTUBE, an electron tube with a photoemissive cathode |
| Answer | Crossword Clue |
|---|---|
| phototubes | A photocell in the form of an electron tube with a photoemissive cathode |
| phototubes | PHOTOTUBE, an electron tube with a photoemissive cathode |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.