A board which has the shape of a parallelepiped.
"Note-Book of Anton Chekhov"
Anton Pavlovich Chekhov
It is desirable to refer to the corresponding case in plane geometry, and to note again that the figure is obtained by passing a plane through the parallelepiped parallel to a lateral edge.
"The Teaching of Geometry"
David Eugene Smith
The same may be said for the proposition about the diagonal plane of a parallelepiped.
"The Teaching of Geometry"
David Eugene Smith