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umber
(redirected from umbered)

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umber: see ocher ocher , mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite.
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umber
1. any of various natural brown earths containing ferric oxide together with lime and oxides of aluminium, manganese, and silicon
2. any of the dark brown to greenish-brown colours produced by this pigment
3. Obsolete
a. any dark, dusky, or indefinite colour

umber [′əm·bər]
(materials)
A naturally occurring brown siliceous earth, deriving its color from iron oxides and manganese oxide; used as a paint pigment.

umber
A naturally occurring brown siliceous earth, containing hydrated iron oxide with small amounts of manganese oxide; used as a pigment in paint; turns red to reddish-brown when calcined, and then is called burnt umber.


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Take an umbered ticket and we'll be right with you," said an old bespectacled stag from behind the desk.
 
 
 
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