Definition:Number Prefixes/20/Icosa-

Definition

The prefix icosa denotes $20$.

Examples

The prefix icosa- can be found in the following contexts:

• icosagon: a polygon with $20$ sides and hence $20$ vertices

• icosahedron: a polyhedron with $20$ faces

Linguistic Note

The prefix icosa- is from the Ancient Greek eíkosi (εἴκοσι), meaning twenty.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): icosa-
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): icosa-