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3 definitions found
 for Acute angle
From The Collaborative International Dictionary of English v.0.48 :

  Acute \A*cute"\, a. [L. acutus, p. p. of acuere to sharpen, fr.
     a root ak to be sharp. Cf. Ague, Cute, Edge.]
     1. Sharp at the end; ending in a sharp point; pointed; --
        opposed to blunt or obtuse; as, an acute angle; an
        acute leaf.
        [1913 Webster]
  
     2. Having nice discernment; perceiving or using minute
        distinctions; penetrating; clever; shrewd; -- opposed to
        dull or stupid; as, an acute observer; acute remarks,
        or reasoning.
        [1913 Webster]
  
     3. Having nice or quick sensibility; susceptible to slight
        impressions; acting keenly on the senses; sharp; keen;
        intense; as, a man of acute eyesight, hearing, or feeling;
        acute pain or pleasure.
        [1913 Webster]
  
     4. High, or shrill, in respect to some other sound; --
        opposed to grave or low; as, an acute tone or accent.
        [1913 Webster]
  
     5. (Med.) Attended with symptoms of some degree of severity,
        and coming speedily to a crisis; -- opposed to chronic;
        as, an acute disease. AS
        [1913 Webster]
  
     Acute angle (Geom.), an angle less than a right angle.
        [1913 Webster]
  
     Syn: Subtile; ingenious; sharp; keen; penetrating; sagacious;
          sharp-witted; shrewd; discerning; discriminating. See
          Subtile.
          [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Angle \An"gle\ ([a^][ng]"g'l), n. [F. angle, L. angulus angle,
     corner; akin to uncus hook, Gr. 'agky`los bent, crooked,
     angular, 'a`gkos a bend or hollow, AS. angel hook, fish-hook,
     G. angel, and F. anchor.]
     1. The inclosed space near the point where two lines meet; a
        corner; a nook.
        [1913 Webster]
  
              Into the utmost angle of the world.   --Spenser.
        [1913 Webster]
  
              To search the tenderest angles of the heart.
                                                    --Milton.
        [1913 Webster]
  
     2. (Geom.)
        (a) The figure made by. two lines which meet.
        (b) The difference of direction of two lines. In the lines
            meet, the point of meeting is the vertex of the angle.
            [1913 Webster]
  
     3. A projecting or sharp corner; an angular fragment.
        [1913 Webster]
  
              Though but an angle reached him of the stone.
                                                    --Dryden.
        [1913 Webster]
  
     4. (Astrol.) A name given to four of the twelve astrological
        "houses." [Obs.] --Chaucer.
        [1913 Webster]
  
     5. [AS. angel.] A fishhook; tackle for catching fish,
        consisting of a line, hook, and bait, with or without a
        rod.
        [1913 Webster]
  
              Give me mine angle: we 'll to the river there.
                                                    --Shak.
        [1913 Webster]
  
              A fisher next his trembling angle bears. --Pope.
        [1913 Webster]
  
     Acute angle, one less than a right angle, or less than
        90[deg].
  
     Adjacent or Contiguous angles, such as have one leg
        common to both angles.
  
     Alternate angles. See Alternate.
  
     Angle bar.
        (a) (Carp.) An upright bar at the angle where two faces of
            a polygonal or bay window meet. --Knight.
        (b) (Mach.) Same as Angle iron.
  
     Angle bead (Arch.), a bead worked on or fixed to the angle
        of any architectural work, esp. for protecting an angle of
        a wall.
  
     Angle brace, Angle tie (Carp.), a brace across an
        interior angle of a wooden frame, forming the hypothenuse
        and securing the two side pieces together. --Knight.
  
     Angle iron (Mach.), a rolled bar or plate of iron having
        one or more angles, used for forming the corners, or
        connecting or sustaining the sides of an iron structure to
        which it is riveted.
  
     Angle leaf (Arch.), a detail in the form of a leaf, more or
        less conventionalized, used to decorate and sometimes to
        strengthen an angle.
  
     Angle meter, an instrument for measuring angles, esp. for
        ascertaining the dip of strata.
  
     Angle shaft (Arch.), an enriched angle bead, often having a
        capital or base, or both.
  
     Curvilineal angle, one formed by two curved lines.
  
     External angles, angles formed by the sides of any
        right-lined figure, when the sides are produced or
        lengthened.
  
     Facial angle. See under Facial.
  
     Internal angles, those which are within any right-lined
        figure.
  
     Mixtilineal angle, one formed by a right line with a curved
        line.
  
     Oblique angle, one acute or obtuse, in opposition to a
        right angle.
  
     Obtuse angle, one greater than a right angle, or more than
        90[deg].
  
     Optic angle. See under Optic.
  
     Rectilineal or Right-lined angle, one formed by two right
        lines.
  
     Right angle, one formed by a right line falling on another
        perpendicularly, or an angle of 90[deg] (measured by a
        quarter circle).
  
     Solid angle, the figure formed by the meeting of three or
        more plane angles at one point.
  
     Spherical angle, one made by the meeting of two arcs of
        great circles, which mutually cut one another on the
        surface of a globe or sphere.
  
     Visual angle, the angle formed by two rays of light, or two
        straight lines drawn from the extreme points of an object
        to the center of the eye.
  
     For Angles of commutation, draught, incidence,
     reflection, refraction, position, repose, fraction,
        see Commutation, Draught, Incidence, Reflection,
        Refraction, etc.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  acute angle
      n 1: an angle less than 90 degrees but more than 0 degrees

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