unseensource
nounUK /ʌnˈsiːn sɔːs/
US /ʌnˈsiːn sɔːrs/
A place or thing where something comes from that you cannot see.
The strange sound had an unseensource somewhere behind the wall.
OTHER MEANINGS
2. A person who gives information without being seen or known.
The reporter protected her unseensource.
3. An invisible supply of something, like water or power.
The village found an unseensource of clean water under the ground.
4. A hidden reason for something happening.
The teacher looked for the unseensource of the noise in the classroom.