solum

noun
so·lum | \ˈsō-ləm \
plural sola\ˈsō-lə \ or solums

Definition of solum 

: the altered layer of soil above the parent material that includes the A and B horizons

First Known Use of solum

1928, in the meaning defined above

History and Etymology for solum

New Latin, from Latin, ground, soil

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The first known use of solum was in 1928

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