A type of organic soil or humus that forms in acidic environments, particularly in forests; also can mean 'more' in some languages.
From Scandinavian languages, particularly Danish and Swedish 'mor' meaning mother, but in soil science referring to a specific type of humus layer. The word entered English through soil classification systems.
Soil scientists have surprisingly poetic names for soil layers—'mor' (acidic humus), 'mull' (alkaline humus), and 'moder' (forest soil)—these Scandinavian-derived terms show how scientific classification borrows from many languages!
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