Definition of "pentagonal" [pen•tag•o•nal]

• Of, relating to, or shaped like a pentagon (adjective)

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• "Occupying the whole southern face of the pentagonal was the sole window -- an immense sheet of unbroken glass from Venice -- a single pane, and tinted of a leaden hue, so that the rays of either the sun or moon passing through it, fell with a ghastly luster on the objects within."
• "Located on the water in a nature preserve area near Wailea, the pentagonal home has several outdoor decks overlooking the coastline."
• "The towers were pentagonal, giving overlapping fields of view—or fields of fire, Scotty thought darkly—along the walls to either side."