Gray langurs or Hanuman langurs, the most widespread langurs of South Asia, are a group of Old World monkeys constituting the entirety of the genus Semnopithecus (from Ancient Greek ÏÎµÎ¼Î½ÏÏ semnÃ³s, ârevered, august, holyâ, and ÏÎ¯Î¸Î·ÎºÎ¿Ï pÃ­thÄkos, âape, monkeyâ).