This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of haven.

adj. Sheltered in a haven.

"As before a dolphin of huge maw fly other fish and fill the nooks of some fair-havened bay, in terror, for he devoureth amain whichsoever of them he may catch; so along the channels of that dread stream the Trojans crouched beneath the precipitous sides."

haven