1n. anything used as a temporary barrier to break the force of the wind, especially when camping.
1772  (1792)  [In the evening we enclosed the fire with a fence of boughs to keep off the wind. . . .]
1897  The snow was cleared away from the inside of the windbreak. . . .
1908  The nights now became bitterly cold, and there were no more old lodges--only a windbreak made of the canoe and the deerskin.
1930  They drew the sleighs up to form a windbreak. . . .
2n. a row or clump of trees serving as protection against the wind and, often, as a means of preventing soil erosion.
1884  Lesser windbreaks are planted where larger are difficult to establish.
1927  The two-hour run from Halifax to Truro was through country [of] rolling hills and rocky ledges, scattered farms with their wind-breaks of spruce trees. . . .
1964  To protect their fields, many farmers of the Quinte area started planting trees as windbreaks and shelterbelts.