from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The perpendicular distance from the center of a regular polygon to any of its sides.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The perpendicular distance from the center of a circle to a chord of the same circle.
- n. The distance from the center of a regular polygon perpendicular to one of its sides (a special case of the above).
from the GNU version of the Collaborative International Dictionary of English
- n. The perpendicular from the center to one of the sides of a regular polygon.
- n. A deposit formed in a liquid extract of a vegetable substance by exposure to the air.
from The Century Dictionary and Cyclopedia
- n. In geometry, a perpendicular let fall from the center of a regular polygon upon one of its sides.
- n. In 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.
apo- + Greek thema, something laid down; see theme.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Greek ἀπόθεμα (apothema, "deposit"), from ἀπό (apo, "off, away") + θέμα (thema, "that which is laid down"). (Wiktionary)