| Answer | Crossword Clue |
|---|---|
| MONO | Kind of rail or plane |
| MONO | Plane or rail variety |
| MONO | Attachment for "rail" or "plane" |
| MONO | Prefix for rail or plane |
| THIRD | Kind of degree or rail |
| GYRO | Kind of plane or scope |
| ASTRAL | Kind of plane or projection |
| JET | Kind of port or plane |
| AERO | Kind of plane or space |
| AERO | Kind of space or plane |
| AERO | Kind of plane or dynamics |
| WAR | Kind of plane or path |
| MONO | Kind of plane or gram |
| twin | compound crystal composed of two adjoining crystals or parts of crystals of the same kind that share a common plane of atoms |
