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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Historical Examples of apothem

British Dictionary definitions for apothem



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
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