citrine ointment
now historical
noun
Any of various yellowish ointments used to treat skin blemishes or eye conditions, made from a range of ingredients including crushed shells, white lead or other minerals, and (sometimes) bark, rind, or juice from a citron, orange, etc.; specifically (since the 18th cent.) an ointment containing mercuric nitrate.
Origin
Late Middle English; earliest use found in Arderne's Treatises of Fistula in Ano.