Definition from Wiktionary, the free dictionary
From Sanskrit विष्णु (Víṣṇu).
Proper noun 
- (Hinduism) One of the Trimurti (trinity) in Hindu mythology, and the most popularly venerated god in Hinduism. Vishnu is commonly depicted as being blue in colour and having four arms: with each hand holding either a lotus, a mace, a conch shell or Chakra weapon. Vishnu is the Supreme being or Ultimate Reality for Vaishnavas and a manifestation of Brahman in the Advaita or Smarta traditions of Hinduism.
- A male given name used in India.