1. A brown or reddish pigment used in both oil and water colours, obtained from certain natural clays variously coloured by the oxides of iron and manganese. It is commonly heated or burned before being used, and is then called burnt umber; when not heated, it is called raw umber. See Burnt umber, below.
2. An umbrere.
(Science: zoology) See grayling.
(Science: zoology) An african wading bird (Scopus umbretta) allied to the storks and herons. It is dull dusky brown, and has a large occipital crest. Called also umbrette, umbre, and umber bird. Burnt umber, a pigment made by burning raw umber, which is changed by this process from an olive brown to a bright reddish brown. Cologne, or german, umber, a brown pigment obtained from lignite. See Cologne earth.
Origin: F. Ombre ocherous ore of iron, terre d'ombre, It. Terra d'ombra, literally, earth of shadow or shade, L. Umbra shadow, shade. Cf. Umber, 3 & 4, Umbrage.
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... on one strand and a thymine on the other strand and between a cytosine base on one strand and a guanine base on the other. This means that the number of A and T residues will be the same in a given double helix as will the number of G and C residues. In RNA, thymine (T) is replaced by uracil ...
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