decagon

noun

deca·​gon ˈde-kə-ˌgän 

: a plane polygon of 10 angles and 10 sides

Illustration of decagon

Examples of decagon in a Sentence

Recent Examples on the Web

Additional study of the hexagon and now a decagon could help astronomers compare formations on the opposite ends of Saturn and learn more about a gas giant's weather patterns, according to NASA. — Eric Lagatta, USA Today, 3 Sep. 2026

The scientists also want to gain a more detailed understanding of the three-dimensional structure of the decagon's clouds, hazes, winds and temperatures. — Charles Q. Choi, Space.com, 2 Sep. 2026

Looking closely at the images, some of the lines of the decagon appear quite fuzzy, which leads Sánchez-Lavega to believe the wave is unstable or still evolving. — Adam Kovac, Scientific American, 2 Sep. 2026

Both sit on jet streams, but the hexagon is practically stationary whereas the decagon migrates eastward at a tame 6 mph (10 kph). — ABC News, 2 Sep. 2026

Word History

Etymology

New Latin decagonum, from Greek dekagōnon, from deka- deca- + -gōnon -gon

First Known Use

circa 1639, in the meaning defined above

Rhymes for decagon

• anlagen
• bandwagon
• snapdragon
• agone
• dragon
• lagan
• waggon
• wagon
• procollagen

Kids Definition

decagon

noun

deca·​gon ˈdek-ə-ˌgän 

: a polygon of 10 angles and 10 sides