- a perpendicular from the center of a regular polygon to one of its sides.
Origin of apothem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for apothem
The "Apothem is a perpendicular from the vertex of a pyramid on a side of the base."
In any pyramid, the apothem is to half the base as the area of the four sides is to the area of the base.
A peculiarity of this pyramid is, that base is to altitude as apothem is to half base.
I have mentioned the above to show how very nearly these ratios agree with my exact ratio of 21 to 34 half base to apothem.
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012