From the genus name.
thuya (plural thuyas)
- Any member of the genus Thuya.
- 1809, James Grey Jackson, An Account of the Empire of Marocco, VIII:
- Thuya, Ara, or Sandrac-tree, is probably the Arbor vitæ of Theophrastus: it is similar in leaf to the juniper, and, besides producing the gum sandrac, the wood is invaluable [...].