having a hooked or curved shape; curved inward like a hook.
From Latin 'aduncus' (hooked or curved). This is a direct borrowing of the Latin adjective, still used in scientific descriptions of animal anatomy.
Naturalists use 'adunc' in formal descriptions—an 'adunc beak' on a parrot or 'adunc talons' on an eagle saves them from writing 'curved and hooked inward' every single time they describe a predator.
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