A parabolic shape is a U-shaped curve that is wider at the opening and gradually narrows towards the end, resembling a bowl or a smiley face. Full definition
With perfect parabolic shapes and a precision equivalent to within a fraction of the thickness of a human hair, this is one of the most precise antennas in the world. (almaobservatory.org)
In his groundbreaking experiments with plastic in the late 1960s, he demonstrated how this modern, industrial material could be tinted with vibrant hues and cast into parabolic shapes using centrifugal force, creating transparent, multi-colored sculptures that serve as lenses through which to see. (artandpractice.org)
Shortly after the Green Bank Telescope (GBT) went online in 2000, measurements of its surface showed that its 2004 aluminum panels needed more tuning to create the dish's perfect parabolic shape. (public.nrao.edu)