RIGHT-ABOUT n.
A turning directly about by the right, so as to face in the opposite direction; also, the quarter directly opposite; as, to turn to the right-about. To send to the right-about, to cause to turn toward the opposite point or quarter; -- hence, of troops, to cause to turn and retreat. [Colloq.] Sir W. Scott.…
RINGWORM n.
A contagious affection of the skin due to the presence of a vegetable parasite, and forming ring-shaped discolored patches covered with vesicles or powdery scales. It occurs either on the body, the face, or the scalp. Different varieties are distinguished as Tinea circinata, Tinea tonsurans, etc., but all are caused by…
RIVETING n.
hind the other. -- Crossed riveting, riveting in which the rivets in one row are set opposite the spaces between the rivets in the next row. -- Double riveting, in lap riveting, two rows of rivets along the seam; in butt riveting, four rows, two on each side of the joint. -- Lap riveting, riveting in which the ends…
RUDBECKIA n.
A genus of composite plants, the coneflowers, consisting of perennial herbs with showy pedunculate heads, having a hemispherical involucre, sterile ray flowers, and a conical chaffy receptacle. There are about thirty species, exclusively North American. Rudbeckia hirta, the black-eyed Susan, is a common weed in meadow…
SALT a.
upa, and Woolly bear, under Woolly. -- Salt-marsh fleabane (Bot.), a strong-scented composite herb (Pluchea camphorata) with rayless purplish heads, growing in salt marshes. -- Salt-marsh hen (Zoöl.), the clapper rail. See under Rail. -- Salt-marsh terrapin (Zoöl.), the diamond-back. -- Salt mine, a mine where rock…
SAND n.
which the body is immersed in hot sand. -- Sand bed, a thick layer of sand, whether deposited naturally or artificially; specifically, a thick layer of sand into which molten metal is run in casting, or from a reducing furnace. -- Sand birds (Zoöl.), a collective name for numerous species of limicoline birds, such a…