heptahedron

hep·ta·he·dron

[hep-tuh-hee-druhn]
noun, plural hep·ta·he·drons, hep·ta·he·dra [-druh] .
a solid figure having seven faces.

Origin:
1650–60; hepta- + -hedron

hep·ta·he·dral, hep·ta·he·dri·cal, adjective
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World English Dictionary
heptahedron (ˌhɛptəˈhiːdrən) [Click for IPA pronunciation guide]
 
n
See also polyhedron a solid figure having seven plane faces
 
hepta'hedral
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Heptahedron is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
the offspring of a zebra and a donkey.
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