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solonetz
solstice
solubilise
solubility
solubilize
soluble
soluble glass
soluble RNA
solum
solus
solute
solution
solution set
Solutrean
solvable
solvate
Solvay process
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solum
so·lum [ sṓləm ]


noun 
Definition:
 
upper layers of soil profile: the upper layer of a soil profile where the formation of new soil takes place and where most plant roots and soil animals are found
[Mid-19th century. < Latin, "ground, foundation"]
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