| Answer | Crossword Clue |
|---|---|
| pyramis | a pyramid (a solid figure with triangular sides meeting in a point) |
| pyramises | PYRAMIS, a pyramid (a solid figure with triangular sides meeting in a point) |
| pyramides | PYRAMID, a solid figure with triangular sides meeting in a point |
| pyramid | to increase by adding gradually / a solid figure with triangular sides meeting in a point |
| trihedron | a solid figure with three plane surfaces meeting at a point |
| trihedrons | TRIHEDRON, a solid figure with three plane surfaces meeting at a point |
| trihedra | TRIHEDRON, a solid figure with three plane surfaces meeting at a point |
