Fraxinus \Frax"i*nus\, prop. n. [L., the ash tree.] (Bot.) A genus of deciduous forest trees, found in the north temperate zone, and including the true ash trees. [1913 Webster] Note: {Fraxinus excelsior} is the European ash; {Fraxinus Americana}, the white ash; {Fraxinus sambucifolia}, the black ash or water ash. [1913 Webster]