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; married woman

Mrs; title used before a married woman's surname

Source: wiktionary.org