Defective stop sign?

• Drama introduces Harry: touching figure!
• Figure a small number continue to badger
• A regular one has internal angles of 140 degrees
• Nine-sider
• Many-sided figure
• Nine-sided figure
• A nine-sided polygon

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones ) + ending from pentagon , etc.

WordNet Word definitions in WordNet
n. a nine-sided polygon

Wikipedia Word definitions in Wikipedia
In geometry , a nonagon (or enneagon ) is a nine-sided polygon or 9-gon. The name "nonagon" is a prefix hybrid formation, from Latin ( nonus , "ninth" + gonon ), used equivalently, attested already in the 16th century in French nonogone and in English from ...