apothem

 : 
Noun
 : 
ap=o=them

CIDE DICTIONARY

apothemn. [Gr. + that which is placed, to place.].
  •  The perpendicular from the center to one of the sides of a regular polygon.  [1913 Webster]
  •  A deposit formed in a liquid extract of a vegetable substance by exposure to the air.  [1913 Webster]

OXFORD DICTIONARY

apothem, n. Geom. a line from the centre of a regular polygon at right angles to any of its sides.

Etymology
Gk apotithemi put aside (as APO-, tithemi place)

For further exploring for "apothem" in Webster Dictionary Online


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