arbor vitae
Concise Oxford English Dictionary © 2008 Oxford University Press:
arbor vitae /ˌɑːbə ˈvʌɪtiː, ˈviːtʌɪ/
▶noun another term for thuja.
– origin C16: from L., lit. ‘tree of life’, prob. with ref. to its medicinal use.
'arbor vitae' also found in these Oxford entries:

