Mĕt'ro-sĭ-dē'rŏs, n.

n. [Gr. μήτρα, heart of a tree, and σίδηρος, iron.] (Bot.) A genus of dicotyledonous plants, including a number of trees or shrubs, found in Australia and the South Sea Islands, and having very hard wood. M. vera is the true ironwood. [Written also metrosiderus.] Baird.