Umber vs Undefined - What's the difference?

As adjectives the difference between umber and undefined

is that umber is of a reddish brown colour, like that of the pigment while undefined is lacking a definition or value.

is a brown clay, somewhat darker than ochre, which contains iron and manganese oxides.

(wikipedia umber)

* (obsolete)

(en noun)

a brown clay, somewhat darker than ochre, which contains iron and manganese oxides.

A grayling.

A dusky brown African wading bird (Scopus umbretta ) allied to the storks and herons.

(-)

Of a reddish brown colour, like that of the pigment.

* J. R. Drake

Their harps are of the umber shade / That hides the blush of waking day.

* *

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(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined