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forest [forest 词源字典]: forest: [13] The underlying sense of forest appears to be ‘outside wooded area’. It comes from the late Latin phrase forestis silva (Latin silva means ‘wood’), which was applied to the royal forests of Charlemagne. The adjective forestis (which became the Old French noun forest) was probably a derivative of Latin forīs ‘outdoor, outside’, which, like forās (source of English foreign), was related to Latin forēs ‘door’. In this context, ‘outside’ presumably meant ‘beyond the main or central fenced area of woodland’.
=> door, foreign, forfeit[forest etymology, forest origin, 英语词源]
warren: warren: [14] A warren is etymologically a ‘fenced-off’ area. The word was acquired from warenne, the Anglo-Norman version of Old French garenne ‘game-park’. This in turn came from Gaulish *varrenna ‘area bounded by a fence’, which was derived from *varros ‘post’. The specific link with rabbits (originally as a reserve set aside for breeding rabbits, now an area where wild rabbits live) is a secondary development.
compound (n.1): 1670s, via Dutch (kampoeng) or Portuguese, from Malay kampong "village, group of buildings." Spelling influenced by compound (v.). Originally, "the enclosure for a factory or settlement of Europeans in the East," later used of South African diamond miners' camps (1893), then of large fenced-in spaces generally (1946).
fence (v.): early 15c., "defend" (oneself); mid-15c. as "protect with a hedge or fence;" from fence (n.). From 1590s as "fight with swords," from the noun in this sense (1530s); see fencing. From 1610s as "knowingly buy or sell stolen goods." Related: Fenced.
forest (n.): late 13c., "extensive tree-covered district," especially one set aside for royal hunting and under the protection of the king, from Old French forest "forest, wood, woodland" (Modern French forêt), probably ultimately from Late Latin/Medieval Latin forestem silvam "the outside woods," a term from the Capitularies of Charlemagne denoting "the royal forest." This word comes to Medieval Latin, perhaps via a Germanic source akin to Old High German forst, from Latin foris "outside" (see foreign). If so, the sense is "beyond the park," the park (Latin parcus; see park (n.)) being the main or central fenced woodland.

Another theory traces it through Medieval Latin forestis, originally "forest preserve, game preserve," from Latin forum in legal sense "court, judgment;" in other words "land subject to a ban" [Buck]. Replaced Old English wudu (see wood (n.)). Spanish and Portuguese floresta have been influenced by flor "flower."
yard (n.1): "patch of ground around a house," Old English geard "fenced enclosure, garden, court; residence, house," from Proto-Germanic *gardaz (cognates: Old Norse garðr "enclosure, garden, yard;" Old Frisian garda, Dutch gaard, Old High German garto, German Garten "garden;" Gothic gards "house," garda "stall"), from PIE *ghor-to-, suffixed form of root *gher- (1) "to grasp, enclose," with derivatives meaning "enclosure" (cognates: Old English gyrdan "to gird," Sanskrit ghra- "house," Albanian garth "hedge," Latin hortus "garden," Phrygian -gordum "town," Greek khortos "pasture," Old Irish gort "field," Breton garz "enclosure, garden," and second element in Latin cohors "enclosure, yard, company of soldiers, multitude").

Lithuanian gardas "pen, enclosure," Old Church Slavonic gradu "town, city," and Russian gorod, -grad "town, city" belong to this group, but linguists dispute whether they are independent developments or borrowings from Germanic. As "college campus enclosed by the main buildings," 1630s. In railway usage, "ground adjacent to a train station or terminus, used for switching or coupling trains," 1827. Yard sale is attested by 1976.