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WORDNET DICTIONARY
CIDE DICTIONARY
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WORDNET DICTIONARY
Noun father-in-law has 1 sense
CIDE DICTIONARY
father-in-law, n.
The father of one's husband or wife; -- correlative to son-in-law and daughter-in-law. [1913 Webster]
" A man who marries a woman having children already, is sometimes, though erroneously, called their father-in-law."
[1913 Webster]
Also see definition of "father-in-law" in Bible Study Dictionaries