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viridarium

viriˈdarium Roman Antiq.
  [L. viridārium plantation of trees, pleasure-garden, f. viridis virid a.]
  A pleasure-garden or green court of an ancient Roman villa or palace.

a 1700 Evelyn Diary 10 Nov. 1644, We went to see Prince Ludovisio's villa where was formerly the Viridarium of the poet Sallust. 1832 W. Gell Pompeiana I. viii. 168 A sort of court, probably planted with flowers, and sometimes called a viridarium. 1848 Lytton Harold i. i, The wide space between the columns, which had once given ample vista from graceful awnings into tablinum and viridarium. 1891 Farrar Darkn. & Dawn x, As Titus went across the viridarium, or chief green court of the Palace.

Oxford English Dictionary

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