RhymeZone: solum definitions

Definitions of Solum:

name: A surname (common: 1 in 100000 families; popularity rank in the U.S.: #13641)

noun: Within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.
noun: The upper layers of a soil profile that are affected by climate.
noun: A surname.

(Definitions from Wiktionary)