noun
ray tissue
Botanical term for the radially oriented tissue in plant stems and roots, also known as medullary rays.
樹木の幹の断面に見える放射状の組織を放射組織という。
The radial tissue visible in a cross-section of a tree trunk is called ray tissue.
Compound of 放射 (ほうしゃ, 'radiation, radial') and 組織 (そしき, 'tissue, structure'), referring to the radial arrangement of cells in plant anatomy.