Superficially, Old Icelandic is poetic (4)

I believe the answer is:

odic

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This might be a double definition.

'superficially old icelandic' is the first definition.
The definition suggests an adjective which matches the answer.

'poetic' is the second definition.
Both the definition and answer are adjectives.
Maybe there's a link between them I don't understand?

'is' is the link.

Can you help me to learn more?

(Another definition for odic that I've seen is " of force".)

I've seen this clue in The Telegraph.

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