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2 definitions found
 for Critical angle
From The Collaborative International Dictionary of English v.0.48 :

  Critical \Crit"ic*al\ (kr[i^]t"[i^]*kal), a. [See Critic, n.,
     [1913 Webster]
     1. Qualified to criticise, or pass judgment upon, literary or
        artistic productions.
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              It is submitted to the judgment of more critical
              ears to direct and determine what is graceful and
              what is not.                          --Holder.
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     2. Pertaining to criticism or the critic's art; of the nature
        of a criticism; accurate; as, critical knowledge; a
        critical dissertation.
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     3. Inclined to make nice distinctions, or to exercise careful
        judgment and selection; exact; nicely judicious.
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              Virgil was so critical in the rites of religion,
              that he would never have brought in such prayers as
              these, if they had not been agreeable to the Roman
              customs.                              --Bp.
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     4. Inclined to criticise or find fault; fastidious; captious;
        censorious; exacting.
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              O gentle lady, do not put me to 't,
              For I am nothing, if not critical.    --Shak.
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     5. Characterized by thoroughness and a reference to
        principles, as becomes a critic; as, a critical analysis
        of a subject.
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     6. [See Crisis.] Pertaining to, or indicating, a crisis,
        turning point, or specially important juncture; important
        as regards consequences; hence, of doubtful issue;
        attended with risk; dangerous; as, the critical stage of a
        fever; a critical situation.
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              Our circumstances are indeed critical. --Burke.
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              The small moment, the exact point, the critical
              minute, on which every good work so much depends.
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     Critical angle (Optics), that angle of incidence of a
        luminous ray at which it is wholly reflected, and no
        portion of it transmitted. The sine of this angle is the
        reciprocal of the refractive index of the medium.
     Critical philosophy, the metaphysical system of Kant; -- so
        called from his most important work, the "Critique of Pure
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From WordNet (r) 3.0 (2006) :

  critical angle
      n 1: the smallest angle of incidence for which light is totally

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