stro·ma / ˈstrōmə/ • n. (pl. -ma·ta / -mətə/ ) 1. Anat. & Biol. the supportive tissue of an epithelial organ, tumor, gonad, etc., consisting of connective tissues and blood vessels. ∎ the spongy framework of protein fibers in a red blood cell or platelet. ∎ Bot. the matrix of a chloroplast, in which the grana are embedded. 2. Bot. a cushionlike mass of fungal tissue, having spore-bearing structures either embedded in it or on its surface. DERIVATIVES: stro·mal adj. ( chiefly Anat. ) stro·mat·ic / strōˈmatik/ adj. ( chiefly Bot. ).
1. A cushion-like mass of fungal tissue in or upon which spore-bearing structures may develop
2. The matrix of chloroplasts, within which the grana (see GRANUM) are embedded. In addition to starch granules and oil droplets, it contains the enzymes responsible for the mediation of the dark reactions of photosynthesis.