Definition of "tetragon" []

• A four-sided polygon; a quadrilateral. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I'm sure she's pulling her gray hair out at missing her chance to baffle both kids and parents with "tetragon", but hey, she could always write a sequel!)"
• "“A tetragon that acts like an octahedron,” the Doctor said."
• "Be there or be an equilateral tetragon with four eight-point angles."