Obverse. Of a coin, the face, or side which bears the principal symbol. The other side is the Reverse.
Ocal, Span. Coarse silk.
Occabus, R. (ὄκκαβος). A kind of spoon.
Occidental Diamond. A precious stone of inferior hardness and beauty.
Occultation. The disappearance or eclipse of one heavenly body behind another.
Ocellata, R. (lit. marked with ocelli or spots). Marbles used as playthings by children.
Ocellated. Full of eyes; said of a peacock’s tail. (See Fig. [398].)
Ochre. Argillaceous earth of different colours which, when finely ground, is used as a pigment. Red ochre is a form of specular iron ore; brown ochre is a variety of hæmatite. The yellow ochres become red when calcined, but the finest reds are made from those which are brown in the bed. Native red ochre is called red chalk or reddle in England. Spanish Brown, Indian Red, Venetian Red, and the yellow ochres have nearly the same composition. The other ochres are known as Oxford, Roman, and stone ochres, and as terra di Sienna and umber. They are all valuable and durable pigments for oil, water, or enamel painting. (See Amatita.)
Ocrea, R. A greave; a piece of armour which covered the shin-bone from below the knee to the ankle. It was generally richly ornamented by designs embossed or chased upon it. (Modern Jambes.)
Octagon. A figure of eight equal sides, considered as an emblem of regeneration; consequently the proper form for baptistries and fonts. (Fairholt.)