1. Any of various chiefly deciduous trees of the genus Fraxinus, having opposite, pinnately compound leaves, clusters of small flowers, and one-seeded winged fruits.

2. The strong, elastic wood of this tree, used for furniture, tool handles, and sporting goods such as baseball bats.

3. Linguistics The letter æ in Old English and some modern phonetic alphabets, representing the vowel sound of Modern English ash.