topedge
nounUK /ˈtɒp.ɛdʒ/
US /ˈtɑːp.ɛdʒ/
The top edge is the very top line or border of something.
She ran her finger along the topedge of the book.
OTHER MEANINGS
2. The upper boundary of a page or printed area.
The header sits along the topedge of the page.
3. The highest rim of a container or surface.
Water spilled over the topedge of the glass.
4. The upper limit of a slope or wall.
We stood at the topedge of the cliff and looked down.