DURUD درود
a Persian word. Arabic as-Salat الصلوة. A benediction; imploring mercy. A part of the stated prayer, recited immediately after the Tashahhud, whilst in the same posture. It is as follows: “O God, have mercy on Muhammad and on his descendants, as Thou didst have mercy on Abraham and on his descendants! Thou art to be praised, and Thou art great! O God, bless Muhammad and his descendants as Thou didst bless Abraham and his descendants. Thou art to be praised and Thou art great.” The merits of this form of prayer are said to be very great; for, according to Anas, the Prophet said, “He who recites it will have blessings on his head ten times, ten sins will be forgiven, and he will be exalted ten step.” (Mishkat, book iv. c. xvii.) [PRAYER.]

Based on Hughes, Dictionary of Islam