meta·se·quoia /-sɪˈkwɔɪə/
  水杉
  metasequoia
       n : large fast-growing Chinese monoecious tree having flat
           bright-green deciduous leaves and small globular cones;
           commonly cultivated in United States as an ornamental;
           known as a fossil before being discovered in China [syn:
           dawn redwood, Metasequoia glyptostrodoides]