'Widow' in the Bible

So David went up there [to Hebron] with his two wives also, Ahinoam of Jezreel and Abigail the widow of Nabal of Carmel [in Judah].

his second, Chileab, by Abigail the widow of Nabal of Carmel; the third, Absalom the son of [his wife] Maacah, daughter of Talmai the king of Geshur;

Then Nathan went [back] to his home.And the Lord struck the child that Uriah’s widow bore to David, and he was very sick.

The king asked her, “What is the matter?” She said, “Truly I am a widow; my husband is dead.