The OED wrote:
nut-brown, adj. and n.
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Pronunciation: Brit. /ˌnʌtˈbraʊn/ , U.S. /ˈnətˈbraʊn/
Forms: see nut n.1 and brown adj.(Show More)
Etymology: < nut n.1 + brown adj. Compare Dutch nootbruin, notebruin, German nussbraun... (Show More)
A. adj.
1. That is the colour of a ripe hazelnut; brown as a nut; of a warm reddish-brown colour.
The answer is, apparently, the Hazelnut.
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