Definition of decagon in English:

decagon

Syllabification: dec·a·gon
Pronunciation: /ˈdekəˌgän
 
/

noun

A plane figure with ten straight sides and angles.
More example sentences
  • How much more sacred than our triangle would be a square, a pentagon, a decagon, a figure with a hundred sides?
  • Decagons Here is a decagon - a 10-sided regular polygon with all its angles equal and all its sides the same length - which has been divided into 10 triangles.
  • You can buy 10-sided dice (bi-pyramids) or else you can cut out a decagon (a 10-sided polygon with all sides the same length) from card and label the sides from to 9.

Origin

mid 17th century: via medieval Latin from Greek dekagōnon, neuter (used as a noun) of dekagōnos 'ten-angled'.

Derivatives

decagonal

Pronunciation: /dəˈkagənl/
adjective
More example sentences
  • We find that some atoms leave the decagonal layers to form icosahedral clusters.
  • The first few odd decagonal numbers are 1, 27, 85, 175, 297,…, and the first few even decagonal numbers are 10, 52, 126, 232, 370, 540,….

Definition of decagon in:

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Word of the day apposite
Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something