One of the mysteries of the English language finally explained.
A planar shape formed by joining a number of identical equilateral triangles by their edges.
1960s; earliest use found in Scientific American. From poly- + iamond, by analogy, taking the d- of diamond (by an intentional false etymology) to represent either di- or duo-: compare polyabolo, polyomino, etc.
In this article we explore how to impress employers with a spot-on CV.