humus

noun

hu·​mus ˈhyü-məs 

ˈyü-

geology : a brown or black complex variable material resulting from partial decomposition of plant or animal matter and forming the organic (see organic entry 1 sense 1a(2)) portion of soil

Examples of humus in a Sentence

Recent Examples on the Web

Burnt soil has obviously lost any mulch that had been present as well as the layer of decomposing organic material or humus just below it. —Joshua Siskin, Orange County Register, 8 Feb. 2025

Including the sand provides better drainage, and the humus in the compost holds nutrients and provides moisture control. —Andy Wilcox, Better Homes & Gardens, 17 July 2024

Made with a blend of sphagnum peat moss, humus, and perlite, this potting mix helps ensure good drainage to keep roots healthy. —Renee Freemon Mulvihill, Better Homes & Gardens, 2 May 2024

When separating clumps, add humus to the new planting area, spread roots out, and water well for smooth transplanting. —Kristin Guy, Sunset Magazine, 6 Feb. 2024

Word History

Etymology

New Latin, from Latin, earth — more at humble

First Known Use

1796, in the meaning defined above

Kids Definition

humus

noun

hu·​mus ˈhyü-məs 

ˈyü-

: a brown or black product of partial decay of plant or animal matter that forms the organic portion of soil

Medical Definition

humus

noun

hu·​mus ˈhyü-məs  ˈyü- 

: a brown or black complex variable material resulting from partial decomposition of plant or animal matter and forming the organic portion of soil