1) Sedimentary rock 
Peloid is mud, or clay used therapeutically, as part of balneotherapy, or therapeutic bathing. Peloids consist of humus and minerals formed over many years by geological and biological, chemical and physical processes. Numerous peloids are available today, of which the most popular are peat pulps, various medicinal clays, mined in various location...
mud or other semi-solid medium used in baths
peloid 1. Mudlike or similar to mud. 2. A therapeutic mud preparation; such as, that which is used in mud packs or mud baths.