A green turban; figuratively, a man whose wife has been unfaithful. Based on historical laws requiring the male relatives of prostitutes to wear green headwear.

The quality of being overly formal, bookish, or pedantic; an old-fashioned or stubborn academic attitude

man whose wife has been unfaithful

To be a cuckold; to have been cheated on by one's partner

A square piece of cloth worn as a headscarf