Meaning of FAMILY in English
In pedology , a group of soils that have similar profiles and include one or more subdivisions called series.
The primary characteristics that define each of the nearly 6,600 identified soil families are the physical and chemical properties
especially texture, mineral composition, temperature, and depth
that are important for the growth of plants.
Britannica Concise Encyclopedia. Краткая энциклопедия Британика. 2012