RAY

n. Ra. Lat., raid. Fr., rate. Ger., Rochen. Any member of the genus Raja. [L, 292 (a, 39).] R. oil. Lat., oleum rajce. Fr., huile (de foie) de raie. Ger., Rochenttiran. A pale or bright-yellow oil obtained from the liver of Raja bat is. IB, 81 (a, 38).] parts radiating from a common centre; hence a pedicel in an umbel of flowers, and by extension the marginal part of a flower-cluster as opposed to the disc; also a flower belonging to the r. or margin. [B, 296 (a, 35).] Actinic r's. Solar r's that produce chemical transformations, [a, 43.] Bipolar r's. R's leading from one centre of radiation to another, as in the amphiaster of an ovum. Branchiostegal r's. Lat.,cosfce branchiostegce. R's supporting a membrane that covers the gills internally in some fishes. [A, 13 (a, 48).] Chemical r's. See Actinic r's. Fin-r. Ger., Flo enstrahl. One of the cartilaginous or o eous rods which form the framework of the fins of fishes. [L.] Medullary r. Lat., radius medullar is. Fr., rayon medulla ire. Ger., Markfortsatz, Markstrahl. 1. In woody plants, one of the vertical plates of parenchyma radiating from the pith to the bark and separating the flbrovascular bundles, [a, 35.] 2. In the pi., see Medullary RADII. Polar r's. See Unipolar FILAMENTS. R. fungus. See ACTINOMYCES. [s. 383]