ApothemA deposit formed in a liquid extract of a vegetable substance by exposure to the air.
Apothem(Math) The perpendicular from the center to one of the sides of a regular polygon.
Century Dictionary and Cyclopedia
napothemIn geometry, a perpendicular let fall from the center of a regular polygon upon one of its sides.
napothemIn pharmaceutics, the more or less completely insoluble brownish substance deposited when vegetable infusions, decoctions, tinctures, etc., are subjected to prolonged evaporation by heat with access of air. The substance or substances out of which it is in this way formed constitute the so-called extractive.
Webster's Revised Unabridged Dictionary
Gr. + that which is placed, to place
Figures even, in their inexorable and systematic order, have their errors just as often as do words and apothems.