What is the meaning of Fru?

Mrs

alternative form of faru

woman

wife

Mrs (Used when addressing a married woman followed by her last name - or (usually on letters, etc.) even with her full name)

Mrs (Used when addressing a married woman followed by her last name - or (usually on letters, etc.) even with her full name)

alternative form of frue

rook

Only used in the adverbial phrase wan fru wan (one by one).

wife

Mrs., Missus, lady, madam (respectful term of address or title for a (married) adult female)

Source: wiktionary.org