Where does “Oktanal” come from?

Oktanal (German) comes from German -ál, from Latin -ālis, from Proto-Italic -ālis — forms relational adjectives.

Ancestry of “Oktanal”, step by step

StepLanguageWordMeaning
1German-álpertaining to, using; adjectival suffix appended to nouns
2Latin-ālis—
3Proto-Italic-ālisforms relational adjectives
Every word from Proto-Italic -ālis →Every word from Latin -ālis →Every word from German -ál →