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(Physics) Radiations first observed by the French physicist Henri Becquerel, in working with uranium and its compounds. They consist of a mixture of alpha, beta, and gamma rays. [ Webster 1913 Suppl. ]

(Physics) a form of ionizing radiation emitted by radioactive substances (such as radium), more penetrating than alpha rays, and consisting of negatively charged electrons. The electrons are the same kind of particle as those of cathode rays, but have much higher velocities (about 35, 000 to 180, 000 miles per second). They are readily deflected by a magnetic or electric field. [ Webster 1913 Suppl. ]

n. (Geol.) A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt. [ 1913 Webster ]

(Elec.) Rays (chiefly cathode rays) developed by the electric discharge in Hittorf tubes. [ Webster 1913 Suppl. ]

pos>n. (Physics.) Rays emanating from the outer surface of a plate composed of any material permeable by cathode rays, as aluminium, which forms a portion of a wall of a vacuum tube, or which is mounted within the tube and exposed to radiation from the cathode. Lenard rays are similar in all their known properties to cathode rays. So called from the German physicist Philipp Lenard (b. 1862), who first described them. [ Webster 1913 Suppl. ]

n. [ OF. orfrais, F. orfroi; F. or gold + fraise, frise, fringe, ruff. See Fraise, and cf. Auriphrygiate. ] See Orphrey. [ Obs. ] Rom. of R. [ 1913 Webster ]

{ }, n. pl. Traces. [ Obs. ] [ 1913 Webster ]

Four white bulls in the trays. Chaucer. [ 1913 Webster ]