What's the difference between parallelepiped and parallelopiped?

Parallelepiped

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Definition:

Example Sentences:

Parallelopiped

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Definition:

• (n.) A solid, the faces of which are six parallelograms, the opposite pairs being parallel, and equal to each other; a prism whose base is a parallelogram.

Example Sentences:

• (1) In order to derive the red cell membrane permeability coefficient from the bulk diffusion coefficient, the red cells were assumed to be packed in a regular manner approximating closely spaced parallelopipeds.