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2 definitions found
 for flat arch
From The Collaborative International Dictionary of English v.0.48 :

  Flat \Flat\ (fl[a^]t), a. [Compar. Flatter (fl[a^]t"r[~e]r);
     superl. Flattest (fl[a^]t"t[e^]st).] [Akin to Icel. flatr,
     Sw. flat, Dan. flad, OHG. flaz, and AS. flet floor, G.
     fl["o]tz stratum, layer.]
     1. Having an even and horizontal surface, or nearly so,
        without prominences or depressions; level without
        inclination; plane.
        [1913 Webster]
              Though sun and moon
              Were in the flat sea sunk.            --Milton.
        [1913 Webster]
     2. Lying at full length, or spread out, upon the ground;
        level with the ground or earth; prostrate; as, to lie flat
        on the ground; hence, fallen; laid low; ruined; destroyed.
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              What ruins kingdoms, and lays cities flat! --Milton.
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              I feel . . . my hopes all flat.       --Milton.
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     3. (Fine Arts) Wanting relief; destitute of variety; without
        points of prominence and striking interest.
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              A large part of the work is, to me, very flat.
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     4. Tasteless; stale; vapid; insipid; dead; as, fruit or drink
        flat to the taste.
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     5. Unanimated; dull; uninteresting; without point or spirit;
        monotonous; as, a flat speech or composition.
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              How weary, stale, flat, and unprofitable
              Seem to me all the uses of this world. --Shak.
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     6. Lacking liveliness of commercial exchange and dealings;
        depressed; dull; as, the market is flat.
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     7. Clear; unmistakable; peremptory; absolute; positive;
     Syn: flat-out.
          [1913 Webster]
                Flat burglary as ever was committed. --Shak.
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                A great tobacco taker too, -- that's flat.
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     8. (Mus.)
        (a) Below the true pitch; hence, as applied to intervals,
            minor, or lower by a half step; as, a flat seventh; A
        (b) Not sharp or shrill; not acute; as, a flat sound.
            [1913 Webster]
     9. (Phonetics) Sonant; vocal; -- applied to any one of the
        sonant or vocal consonants, as distinguished from a
        nonsonant (or sharp) consonant.
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     10. (Golf) Having a head at a very obtuse angle to the shaft;
         -- said of a club.
         [Webster 1913 Suppl.]
     11. (Gram.) Not having an inflectional ending or sign, as a
         noun used as an adjective, or an adjective as an adverb,
         without the addition of a formative suffix, or an
         infinitive without the sign to. Many flat adverbs, as in
         run fast, buy cheap, are from AS. adverbs in -["e], the
         loss of this ending having made them like the adjectives.
         Some having forms in ly, such as exceeding, wonderful,
         true, are now archaic.
         [Webster 1913 Suppl.]
     12. (Hort.) Flattening at the ends; -- said of certain
         [Webster 1913 Suppl.]
     Flat arch. (Arch.) See under Arch, n., 2. (b).
     Flat cap, cap paper, not folded. See under Paper.
     Flat chasing, in fine art metal working, a mode of
        ornamenting silverware, etc., producing figures by dots
        and lines made with a punching tool. --Knight.
     Flat chisel, a sculptor's chisel for smoothing.
     Flat file, a file wider than its thickness, and of
        rectangular section. See File.
     Flat nail, a small, sharp-pointed, wrought nail, with a
        flat, thin head, larger than a tack. --Knight.
     Flat paper, paper which has not been folded.
     Flat rail, a railroad rail consisting of a simple flat bar
        spiked to a longitudinal sleeper.
     Flat rods (Mining), horizontal or inclined connecting rods,
        for transmitting motion to pump rods at a distance.
     Flat rope, a rope made by plaiting instead of twisting;
        gasket; sennit.
     Note: Some flat hoisting ropes, as for mining shafts, are
           made by sewing together a number of ropes, making a
           wide, flat band. --Knight.
     Flat space. (Geom.) See Euclidian space.
     Flat stitch, the process of wood engraving. [Obs.] -- Flat
     tint (Painting), a coat of water color of one uniform shade.
     To fall flat (Fig.), to produce no effect; to fail in the
        intended effect; as, his speech fell flat.
        [1913 Webster]
              Of all who fell by saber or by shot,
              Not one fell half so flat as Walter Scott. --Lord
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From WordNet (r) 3.0 (2006) :

  flat arch
      n 1: an arch with mutually supporting voussoirs that has a
           straight horizontal extrados and intrados [syn: flat
           arch, straight arch]

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