cactus       
noun [ C ] uk/ˈkæk.təs/ us/ˈkæk.təs/  cacti uk/ˈkæk.taɪ / us/ˈkæk.taɪ / cactuses
 仙人掌
any of many types of desert plant, usually with sharp spines (= long points) and thick stems for storing water
  The only thing that grows here is an occasional sage bush or cactus. 
Spectacular giant cacti stand on the hillside.
 - More examples
 - Probably the most famous desert plant is the cactus.
 - The courtyards of the house are full of cactuses and cages of tropical birds.
 - This volcanic mountain is the home of cacti, lizards, and flightless birds that have become extinct everywhere else on earth.
 - The restaurant is painted in colourful shades and decorated with cacti and other Mexican symbols.