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From dog +‎ hair, by analogy with the thick hair on the back of a dog.


doghair (uncountable)

  1. (forestry) Pine forest where the trees have grown extremely thin and close together.
    • 1983, United States. Bureau of Land Management. Platte River Resource Area, Forest ecology/plant identification trail[1], page 7:
      Doghair stands result from too many pine trees regenerating following fire or clearcutting which opens the forest canopy.
    • 1990, Olympic National Forest (N.F.), Land and Resource(s) ...[2], page 142:
      The acres of doghair will continue to decline, due to the experimental program.
    • 2001, I Hear the Train: Reflections, Inventions, Refractions[3], →ISBN, page 55:
      In front of us was a stand of doghair pine, the kind of stunted, thin trees that grow close together like grass, each stem maybe three to six inches in diameter.