apothem

[ap-uh-them]
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noun Geometry.

a perpendicular from the center of a regular polygon to one of its sides.

Origin of apothem

1855–60; < French apothème, probably on the model of Greek hypóthēma base; see apo-, theme
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British Dictionary definitions for apothem

apothem

noun

the perpendicular line or distance from the centre of a regular polygon to any of its sides

Word Origin for apothem

C20: from apo- + Greek thema, from tithenai to place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012