Material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use) WordNet 3.0 & Open English WordNet

Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support the life of plants and soil organisms. Wikipedia

Naturally occurring granular covering on the surface of Earth, capable of supporting life. Wikipedia Disambiguation

Natural body consisting of layers that are primarily composed of minerals Wikidata

A mixture of sand and organic material, used to support plant growth. OmegaWiki

The top layer of the land surface of the earth that is composed of disintegrated rock particles, humus, water and air. OmegaWiki

The unconsolidated mineral or organic matter on the surface of the earth that has been subjected to and shows effects of genetic and environmental factors of: climate (including water and temperature effects), and macro- and microorganisms, conditioned by relief, acting on parent material over a period of time. A product-soil differs from the material from which it is derived in many physical, chemical, biological, and morphological properties and characteristics. Wiktionary