Madhusudanah is another name of Vishnu or God and is the 73rd name in the Vishnu sahasranama.

According to Adi Sankara' s commentary on the Vishnu sahasranama, Madusudanah means the destroyer of the demon Madhu.

Reference: Cited from Sri Vishnu Sahasranama, commentary by Sri Sankaracharya, translated by Swami Tapasyananda, available at Sri Ramakrishna Math, Chennai; available at an Indian web site and a US site.