parallelepipedonal

WordReference Random House Unabridged Dictionary of American English © 2026

par•al•lel•e•pi•ped  (par′ə lel′ə pī′pid, -pip′id), n. 

1. Mathematics a prism with six faces, all parallelograms.

Also, par•al•lel•e•pip•e•don  (par′ə lel′ə pip′i don′, -dən), par′al•lel′o•pi′ped. 

• Greek parallēlepípedon body with parallel surfaces, equivalent. to parállēl(os) parallel + epípedon plane, noun, nominal use of neuter of epípedos flat, equivalent. to epi- epi- + pédon ground
• 1560–70;

par•al•lel•e•pip•e•dic  (par′ə lel′ə pip′i dik), par′al•lel′e•pip′e•don′al, par′al•lel′e•pip′e•dous, adj.