The spelling of the word "boldin" can be a bit confusing. It is pronounced as /ˈboʊldɪn/, with the stress on the first syllable. The letter "o" is pronounced as "oh" and the letter "i" is pronounced as a short "ih" sound. The "d" and "n" are pronounced as normal, and the final letter "in" is pronounced as "ihn". While the spelling might suggest a long "i" sound, the correct pronunciation is with a short "i" sound.
Boldoglucin, a glucoside from boldus; cholagogue and diuretic, employed in rheumatism and hepatic troubles in doses of gr. 1-3 (0.06-0.2).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
There is no information available on the etymology of the word "boldin". It is possible that it could be a surname or a specific term with limited usage or relevance.