trifoliate
/traɪˈfəʊlɪət/adjective
1- (of a compound leaf) having three leaflets（复叶）有三小叶的：
dark green trifoliate leaves.
墨绿色三小叶。
1.1
- (of a plant) having such leaves（植物）有三小叶的。
1.2
- (of an object or design) having the form of such a leaf（物体, 图案）三小叶状的：
a bronze trifoliate key handle.
一把三小叶状的铜钥匙柄。