A chemical compound or substance, possibly a plant-derived alkaloid, though its exact modern use and definition is quite obscure.
Appears to combine Greek aitia (cause) with phyllon (φύλλον, leaf), suggesting a leaf-based substance believed to have causal or medicinal properties, though the term is largely obsolete.
This is one of those weird old scientific names that shows how differently scientists used to classify things—they'd just mash together Greek words describing what they thought the substance did or where it came from, without understanding its actual chemistry.
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