The Collaborative International Dictionary of English v.0.48:

Salient \Sa"li*ent\, a. [L. saliens, -entis, p. pr. of salire to
   leap; cf. F. saillant. See Sally, n. & v. i..]
   1. Moving by leaps or springs; leaping; bounding; jumping.
      "Frogs and salient animals." --Sir T. Browne.
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   2. Shooting out or up; springing; projecting.
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            He had in himself a salient, living spring of
            generous and manly action.            --Burke.
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   3. Hence, figuratively, forcing itself on the attention;
      prominent; conspicuous; noticeable.
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            He [Grenville] had neither salient traits, nor
            general comprehensiveness of mind.    --Bancroft.
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   4. (Math. & Fort.) Projecting outwardly; as, a salient angle;
      -- opposed to reentering. See Illust. of Bastion.
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   5. (Her.) Represented in a leaping position; as, a lion
      salient.
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   Salient angle. See Salient, a., 4.

   Salient polygon (Geom.), a polygon all of whose angles are
      salient.

   Salient polyhedron (Geom.), a polyhedron all of whose solid
      angles are salient.
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WordNet (r) 3.0 (2006):

salient angle
    n 1: an angle pointing outward; an interior angle of a polygon
         that is less than 180 degrees [ant: reentering angle,
         reentrant angle]