Resembling, containing, or relating to copal resin; having the properties of copal.
From 'copal' plus the adjectival suffix '-ine' (meaning resembling or relating to), following standard English adjective formation.
Using '-ine' to mean 'resembling' or 'made of' is how English creates adjectives from nouns—so 'golden' (made of gold) and 'copaline' (made of/like copal) follow the same linguistic pattern.
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