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

[Latin, base, ground.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Among other conditions, permission was granted to the developer Solum Regeneration subject to the company building seven units of affordable housing and a new community facility, including a [pounds sterling]200,000 contribution for internal fittings.
The scheme, called "Redhill Forward", is a joint venture shared by Network Rail and Solum, which owns the land around Redhill station.
Davis Polk partner Sarah Solum led the team that advised Affymetrix Inc.
According to Solum, while the unsolicited offer from Origin was higher than what Thermo Fisher offered, Affymetrix's board ultimately decided that the Origin offer had too many uncertainties.
Summary: Davis Polk partner Sarah Solum led the team that advised Affymetrix Inc.
Solum, Stefanie, Women, Patronage, and Salvation in Renaissance Florence: Lucrezia Tornabuoni and the Chapel of the Medici Palace (Visual Culture in Early Modernity), Farnham, Ashgate, 2015; hardback; pp.
For this reason, Stefanie Solum's new monograph performs an important task.
In this essay, I shall not judge the debate between Solum and Bennett.