invisibleclasp
nounUK /ɪnˈvɪzəbəl klɑːsp/
US /ɪnˈvɪzəbəl klæsp/
A clasp is a small thing that holds something shut, and invisible means you cannot see it.
The necklace had an invisibleclasp, so it looked like magic.
OTHER MEANINGS
2. A way of joining two things that is hidden from view.
The box used an invisibleclasp to stay closed.
3. A magic or pretend lock that no one can see.
In the story, the treasure chest had an invisibleclasp.
4. A small hidden hook on clothing that keeps it neat.
Her dress had an invisibleclasp at the back.