See under sienna (def 1).
an intense dark reddish-brown color.
a ferruginous earth used as a yellowish-brown pigment (raw sienna) or, after roasting in a furnace, as a reddish-brown pigment (burnt sienna)
the color of such a pigment.
a reddish-brown dye or pigment obtained by roasting raw sienna in a furnace
a dark reddish-orange to reddish-brown colour
a natural earth containing ferric oxide used as a yellowish-brown pigment when untreated (raw sienna) or a reddish-brown pigment when roasted (burnt sienna)
the colour of this pigment See also burnt sienna
See under umber (def 1). an earth consisting chiefly of a hydrated oxide of iron and some oxide of manganese, used in its natural state as a brown pigment (raw umber) or, after heating, as a reddish-brown pigment (burnt umber) the color of such a pigment; dark dusky brown or dark reddish brown. Ichthyology. the […]
noun a small orchid, Orchis ustulata, resembling the lady orchid, having dark reddish-brown hoods that give a burnt look to the tip of the flower spike
the nuclear fuel consumed in a reactor, often measured as a percentage of the atoms of fuel that have undergone fission.
noun (Scot & Irish, dialect) (pl) -roos the government office from which unemployment benefit is distributed the unemployment benefit itself (esp in the phrase on the buroo)