A principal host; a chief entertainer or someone of supreme hospitality.
From arch- (chief, supreme) + host (a person who receives guests). Host comes from Old French hoste, from Latin hospita, feminine of hospes (host, guest, stranger).
In medieval and Renaissance literature, an 'archhost' was someone who achieved such legendary generosity and hospitality that they became famous for it—this was a mark of nobility and virtue, so the superlative form was actually a high compliment.
Complete word intelligence in one call. Free tier — 50 lookups/day.