The Collaborative International Dictionary of English v.0.48:

Harp \Harp\ (h[aum]rp), n. [OE. harpe, AS. hearpe; akin to D.
   harp, G. harfe, OHG. harpha, Dan. harpe, Icel. & Sw. harpa.]
   1. A musical instrument consisting of a triangular frame
      furnished with strings and sometimes with pedals, held
      upright, and played with the fingers.
      [1913 Webster]

   2. (Astron.) A constellation; Lyra, or the Lyre.
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   3. A grain sieve. [Scot.]
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   Aeolian harp. See under Aeolian.
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   Harp seal (Zool.), an arctic seal (Phoca Gr[oe]nlandica).
      The adult males have a light-colored body, with a
      harp-shaped mark of black on each side, and the face and
      throat black. Called also saddler, and saddleback. The
      immature ones are called bluesides; their fur is white,
      and they are killed and skinned to harvest the fur.

   Harp shell (Zool.), a beautiful marine gastropod shell of
      the genus Harpa, of several species, found in tropical
      seas. See Harpa.
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The Collaborative International Dictionary of English v.0.48:

Saddleback \Sad"dle*back`\, a.
   Same as Saddle-backed.
   [1913 Webster]

   Saddleback roof. (Arch.) See Saddle roof, under Saddle.
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The Collaborative International Dictionary of English v.0.48:

Saddleback \Sad"dle*back`\, n.
   1. Anything saddle-backed; esp., a hill or ridge having a
      concave outline at the top.
      [1913 Webster]

   2. (Zool.)
      (a) The harp seal.
      (b) The great blackbacked gull (Larus marinus).
      (c) The larva of a bombycid moth (Empretia stimulea)
          which has a large, bright green, saddle-shaped patch
          of color on the back.
          [1913 Webster]

WordNet (r) 3.0 (2006):

saddleback
    n 1: a pass or ridge that slopes gently between two peaks (is
         shaped like a saddle) [syn: saddleback, saddle]
    2: a double sloping roof with a ridge and gables at each end
       [syn: gable roof, saddle roof, saddleback, saddleback
       roof]