- The definition of humus is partially decomposed organic matter.
Partially decomposed plant matter in the soil is an example of humus.
humus definition by Webster's New World
Origin: Classical Latin earth, ground, soil ; from Indo-European an unverified form ĝhom-: see homo
humus definition by American Heritage Dictionary
Origin: Latin, soil; see dhghem- in Indo-European roots.
humus - Science Definition