I heard Laith b. Said as saying: Al-Hamv means the brother of husband or like it from amongst the relatives of the husband, for example, cousin, etc.
Sahih Muslim Book 39, Hadith 30
← Previous Hadith This hadith has been narrated on the authority of Yazid b. Abu Habib with the same chain of transmitters.

Sahih Muslim Book 39, Hadith 29 Next Hadith → I did not see but good only (in my wife). Thereupon Allah's Messenger (ﷺ) said: Verily Allah has made her immune from all this. Then Allah's Messenger (ﷺ) stood on the pulpit and said: After this day no man should enter the house of another person in his absence, but only when he is accompanied by one person or two persons.

Sahih Muslim Book 39, Hadith 31