apothem

[ap-uh-them]
noun Geometry.
a perpendicular from the center of a regular polygon to one of its sides.

Origin:
1855–60; < French apothème, probably on the model of Greek hypóthēma base; see apo-, theme

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World English Dictionary
apothem (ˈæpəˌθɛm)
 
n
the perpendicular line or distance from the centre of a regular polygon to any of its sides
 
[C20: from apo- + Greek thema, from tithenai to place]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
When gm is final drop the silent g: apothem, diagram, flem.
The apothem can be used to determine the area of the polygon.
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