The word "saprol" is a bit of an enigma when it comes to spelling. The correct spelling of the word is actually "saprolite," which refers to a clay-like material that forms from the alteration of rocks by weathering. The pronunciation is /ˈsæprəlaɪt/, with the stress on the second syllable. The confusion with the spelling of "saprol" likely stems from the fact that it is sometimes used as a shortened form of "saprophyte," which is a type of plant that obtains nutrients from dead organic matter. The correct spelling of "saprophyte" is /ˈsæprəfaɪt/.
A disinfectant mixture of cresols in mineral oil.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.