Where does “laudanum” come from?

I need to work through this chain carefully, but I notice a problem: the chain provided seems to trace "laus" (Latin for "praise") back through PIE, but "laudanum" is the headword and its meaning is listed as unknown. Looking at the chain structure, it appears to show: - Latin laudo → Latin laus → PIE lēwt- → PIE lēw- → Proto-Italic -os → PIE -ós This seems malformed for tracing "laudanum" specifically. Laudanum is actually a medieval/early modern Latin term for a medicine/drug preparation, but the chain provided doesn't clearly support that meaning development. Given the instruction to "state only what the chain supports" and that the meaning is unknown, I cannot accurately write a sentence that weaves in a meaning or explains sense development when none is provided and the chain seems incomplete or unclear. However, if I

laudanum (English): A tincture of opium, once widely used for various...