Fanuidhol was one of the three peaks in the Misty Mountains (with Caradhras and Celebdil) that lay above the ancient dwarf-city of Khazad-dûm. A short name used by the Dwarves was Shathûr - in full Bundushathûr. It has the same meaning in Khuzdul as Fanuidhol in Sindarin - they both mean Cloudyhead.
In the common tongue, Fanuidhol was called "Cloudyhead". Both Bundushathûr and Fanuidhol translate to this.