Relating to or containing bismuth, or describing properties characteristic of the element bismuth.
From 'bismuth' + '-al' (common adjectival suffix). A straightforward formation creating an adjective from the element name, similar to 'thermal' from 'therm.'
The suffix '-al' is English's favorite way to turn nouns into adjectives—bismuthal, thermal, chemical—it's so common that when you hear a word ending in '-al' you automatically know it means 'relating to' whatever came before!
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