elm
楡 centers on the elm tree, a specific type of deciduous tree. The meaning is straightforward and refers to the tree itself.
楡 combines 木 (tree) with 兪, which likely contributes the sound ユ. The character was created to represent the elm tree specifically.
The left side 木 means tree, and the right side 兪 looks like a roof over a moon and a knife. Imagine an elm tree with a distinctive canopy that shelters the moon and a knife stuck in its bark.
For ユ, picture you standing under an elm tree: you -> ユ, and the tree is an elm.