|Noah Webster's Dictionary|
(n.) The brother of one's husband or wife; also, the husband of one's sister; sometimes, the husband of one's wife's sister.
Int. Standard Bible Encyclopedia
See RELATIONSHIPS, FAMILY.
Brother-in-law (5 Occurrences)
Genesis 38:8 Then Judah said to Onan, Go in to thy brother's wife, and fulfil to her the brother-in-law's duty, and raise up seed to thy brother. (DBY NAS RSV NIV)
Deuteronomy 25:5 If brothers are living together and one of them, at his death, has no son, the wife of the dead man is not to be married outside the family to another man: let her husband's brother go in to her and make her his wife, doing as it is right for a brother-in-law to do. (BBE)
Deuteronomy 25:7 And if the man like not to take his brother's wife, then his brother's wife shall go up to the gate unto the elders, and say: 'My husband's brother refuseth to raise up unto his brother a name in Israel; he will not perform the duty of a husband's brother unto me.' (See NIV)
Judges 1:16 The children of the Kenite, Moses' brother-in-law, went up out of the city of palm trees with the children of Judah into the wilderness of Judah, which is in the south of Arad; and they went and lived with the people. (WEB ASV)
Judges 4:11 Now Heber the Kenite had separated himself from the Kenites, even from the children of Hobab the brother-in-law of Moses, and had pitched his tent as far as the oak in Zaanannim, which is by Kedesh. (WEB ASV BBE NIV)