par·al·lel·o·gram 
(păr′ə-lĕlə-grăm′)
(păr′ə-lĕlə-grăm′)n.
A four-sided plane figure with opposite sides parallel.
[Late Latin parallēlogrammum, from Greek parallēlogrammon, from neuter sing. of parallēlogrammos, bounded by parallel lines : parallēlos, parallel; see PARALLEL + grammē, line; see gerbh- in the Appendix of Indo-European roots.]
parallelogram- antidrug
- antielectron
- antienzyme
- antiestablishment
- antiestablishmentarian
- antiestablishmentarianism
- Antietam
- antifebrile
- antifederalism
- antifederalist
- antifeminism
- antifeminist
- antifertility
- antiflatulent
- antifouling
- antifreeze
- antifungal
- antigen
- antigene
- antigenic
- antigenically
- antigenicity
- Antigone
- antigravity
- Antigua and Barbuda