firmpiece
nounUK /ˈfɜːmpiːs/
US /ˈfɜːrmpiːs/
A firmpiece is a strong, solid part of something.
The carpenter used a firmpiece of wood to make the table strong.
OTHER MEANINGS
2. A main or essential part of a whole.
Trust is the firmpiece of a good friendship.
3. A fixed or unchanging piece of something.
The firmpiece of the puzzle stayed in place.
4. A piece that holds other pieces together.
The firmpiece kept the toy tower from falling.