Definition of tree lilac
: a lilac of treelike form; especially : a broad-spreading white-flowered Japanese tree (Syringa amurensis japonica or S. japonica) that may exceed 35 feet in height
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up tree lilac? Please tell us where you read or heard it (including the quote, if possible).