Definition of nonagon in English:

nonagon

Line breaks: non|agon
Pronunciation: /ˈnɒnəg(ə)n
 
/

noun

  • A plane figure with nine straight sides and nine angles.
    More example sentences
    • The room is shaped as a large nonagon, its sheer walls, a flat metallic grey, rising almost two stories up and curving into a dome.
    • What's the perimeter of a nonagon whose sides are each twice the length of the side of a square whose area is 16 square units?

Derivatives

nonagonal

adjective

Origin

mid 17th century: formed irregularly from Latin nonus 'ninth', on the pattern of words such as hexagon.

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Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody