1
a
: a moderate to dark yellowish brown
b
: a moderate brown
2
: a brown earth that is darker in color than ocher and sienna because of its content of manganese and iron oxides and is highly valued as a permanent pigment either in the raw or burnt state
: of, relating to, or having the characteristics of umber
specifically
: of the color of umber
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Merriam-Webster unabridged
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