Definition from Wiktionary, the free dictionary
treant (plural treants)
- (fantasy role-playing games) A fictional organism having many characteristics of a tree, but with human-like mobility and facial features.
1977, Gary Gygax, Monster Manual, page 96:
- Treants are strangely related to humans and trees, combining features of both species. ...an individual treant can cause only one or two normal trees to move and attack as stipulated.