An Etymological Dictionary of Astronomy and Astrophysics

1. A large tract of land covered with trees and underbrush; woodland (Dictionary.com).
   

   2. In → graph theory, a → graph which contains no → cycles. The connected components of a forest are → trees.

Etymology (EN): M.E., from O.Fr. forest, probably from L.L. forestis (silva) “the outside woods,” from L. foris “outside.”

Etymology (PE): Jangal “a wood, forest, a vast land with plenty of trees;” cf. Skt. jangala- “arid , sparingly grown with trees and plants.”