| Answer | Crossword Clue |
|---|---|
| WIKIPEDIA | Expanding on-line reference |
| AXIS | Reference line on a graph |
| XAXIS | Horizontal reference line on a graph |
| YAXIS | Vertical reference line on a graph |
| AXIS | Line of reference on a graph |
| PRIMEMERIDIAN | Geographical reference line |
| AXIS | Geometric reference line |
| XAXIS | Graph reference line |
| YAXIS | Algebraic reference line |
| AXILE | Near a reference line |
| XAXIS | Reference line, in math |
