quadrangular

[kwo-drang-gyuh-ler]
adjective
having four angles and four sides; having the shape of a quadrangle.

Origin:
1585–95; < Late Latin quadrangulāris, equivalent to quadrangul(um) quadrangle + -āris -ar1

quadrangularly, adverb
quadrangularness, noun
subquadrangular, adjective
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World English Dictionary
quadrangle (ˈkwɒdˌræŋɡəl)
 
n
1.  geometry a plane figure consisting of four points connected by four lines. In a complete quadrangle, six lines connect all pairs of points
2.  Often shortened to: quad a rectangular courtyard, esp one having buildings on all four sides
3.  the building surrounding such a courtyard
 
[C15: from Late Latin quadrangulum figure having four corners]
 
quadrangular
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It goes without saying: a triangular pyramid is always surrounded by six quadrangular pyramids.
The butterfly is brown with yellow and white quadrangular spots on the forewings.
The stockade was quadrangular in shape with four sides of different lengths.
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