solum

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so·lum

 (sō′ləm)
n. pl. so·la (-lə) or so·lums
The upper layers of a soil profile in which topsoil formation occurs.

[Latin, base, ground.]

solum

(ˈsəʊləm)
n, pl -lums or -la (-lə)
(Physical Geography) the upper layers of the soil profile, affected by climate and vegetation
[C19: New Latin from Latin: the ground]