"Spìrösäl" is a word with a unique spelling, which can be explained with its IPA phonetic transcription. The stress falls on the second syllable, and it is pronounced as /ˈspɪrəˌsɑl/. It is a combination of two words, "spiro" meaning "spiral" and "sal" meaning "salt." Therefore, "spirosal" refers to a substance that is in a spiraled or coiled form and contains salt. This word is relatively uncommon and not frequently used in everyday speech.
Trade name of the monoglycol ester of salicylic acid, recommended as an external application in rheumatism and other painful conditions.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.