| Answer | Crossword Clue |
|---|---|
| passive | Relating to or denoting heating systems that make use of incident sunlight as an energy source |
| Answer | Crossword Clue |
|---|---|
| passive | Relating to or denoting heating systems that make use of incident sunlight as an energy source |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.