Pedon

Part of speech: noun

Definitions

1. A discrete unit of soil characterized by unique properties relating to its physical, chemical, and biological attributes
2. A soil unit that is distinct in its characteristics, encompassing physical, chemical, and biological properties
3. A unique segment of soil defined by its particular physical, chemical, and biological features

Etymology: "Pedon" is a modern scientific coinage, not an ancient word. It combines "pedo-", from Greek "pedon" meaning "ground" or "soil," with the suffix "-on," a common ending in English technical terms borrowed from Greek to name a unit or particle, as in "electron" or "neutron." The term names the smallest three-dimensional body of soil that soil scientists treat as a single representative sample of a soil type. Its formation follows the same pattern as other scientific words built from classical Greek roots: a researcher needed a precise label for a concept, and drew on a root that already meant earth to make one. Because the word was built deliberately from a classical root, its meaning is set by the field that defined it rather than by any older usage. Its sense as a basic unit of soil classification is the only one it carries.