so·lum
| \ ˈsō-ləm
\
\
plural sola\
ˈsō-lə
\ or solums
\ or solums
Definition of solum
: the altered layer of soil above the parent material that includes the A and B horizons
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“Solum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/solum. Accessed 25 Jan. 2022.
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Time Traveler for solum
The first known use of solum was in 1928
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