What is "dhrishtadyumna"

Dhrishtadyumna ( Sanskrit: धृष्टद्युम्न, dhṛṣṭadyumna, lit. he who is courageous and splendorous), also known as Draupada ( Sanskrit: द्रौपद, lit. son of Drupada), was the son of Drupada and brother of Draupadi and Shikhandi in the epic Mahabharata. He was the commander of the Pandava army during the Kurukshetra War. Dhrishtadyumna killed Drona, the royal guru, when he was meditating which was against the rules of engagement.