OriginLatin ulmus (“elm”), + -in: compare French ulmine.
- countable, uncountableA brown amorphous substance found in decaying vegetation.
“The biological features of perennial grasses involve the decomposition of their residues during the period of domination of anaerobic processes, capable of producing active humus (ulminic acid and ulm”
Formsulmins(plural) · ulmine(alternative)
Source: Wiktionary