[1] : The Collaborative International Dictionary of English v.0.48

valley \val"ley\, n.; pl. valleys. oe. vale, valeie, of.
   val'ee, valede, f. vall'ee, ll. vallata, l. vallis,
   valles. see vale.
   1913 webster
   1. the space inclosed between ranges of hills or mountains;
      the strip of land at the bottom of the depressions
      intersecting a country, including usually the bed of a
      stream, with frequently broad alluvial plains on one or
      both sides of the stream. also used figuratively.
      1913 webster

            the valley of the shadow of death.    --ps. xxiii.
                                                  4.
      1913 webster

            sweet interchange
            of hill and valley, rivers, woods, and plains.
                                                  --milton.
      1913 webster

   note: deep and narrow valleys with abrupt sides are usually
         the results of erosion by water, and are called
         gorges, ravines, canyons, gulches, etc.
         1913 webster

   2. arch.
      a the place of meeting of two slopes of a roof, which
          have their plates running in different directions, and
          form on the plan a reentrant angle.
      b the depression formed by the meeting of two slopes on
          a flat roof.
          1913 webster

   valley board arch., a board for the reception of the lead
      gutter in the valley of a roof. the valley board and lead
      gutter are not usual in the united states.

   valley rafter, or valley piece arch., the rafter which
      supports the valley.

   valley roof arch., a roof having one or more valleys. see
      valley, 2, above.
      1913 webster
see also:
valleys vale gorges ravines canyons gulches 
valley board valley rafter valley piece valley roof valley 

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