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A.Word.A.Day--hendecagon hendecagon (hen-DEK-uh-gon) noun An eleven-sided polygon. [From Greek hendeca- (eleven), from hen, neuter of heis (one) + deka (ten) + -gon (angled), from gonia (angle).] Another name for hendecagon is undecagon. A solid having eleven faces is called a hendecahedron or an undecahedron. The Canadian dollar coin, nicknamed Loonie, is a hendecagon. And a hendecagon surrounds the portrait on the US Susan B. Anthony dollar coin. "This is an 11-sided polygon, which may also be called a hendecagon." Thomas H. Sidebotham; The A to Z of Mathematics: A Basic Guide; Wiley-Interscience; 2002. "The setting is decadent forests inhabited by 'truncated undecagon figures', fragments of selves." Suzanne Nalbantian; Anais Nin: Literary Perspectives; Palgrave Macmillan; 1997. This week's theme: words related to the number eleven. X-Bonus And Silence, like a poultice, comes / To heal the blows of sound. -Oliver Wendell Holmes Sr., poet, novelist, essayist, and physician (1809-1894)

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