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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.,
     Crisis.]
     [1913 Webster]
     1. Qualified to criticise, or pass judgment upon, literary or
        artistic productions.
        [1913 Webster]
  
              It is submitted to the judgment of more critical
              ears to direct and determine what is graceful and
              what is not.                          --Holder.
        [1913 Webster]
  
     2. Pertaining to criticism or the critic's art; of the nature
        of a criticism; accurate; as, critical knowledge; a
        critical dissertation.
        [1913 Webster]
  
     3. Inclined to make nice distinctions, or to exercise careful
        judgment and selection; exact; nicely judicious.
        [1913 Webster]
  
              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.
                                                    Stillingfleet.
        [1913 Webster]
  
     4. Inclined to criticise or find fault; fastidious; captious;
        censorious; exacting.
        [1913 Webster]
  
              O gentle lady, do not put me to 't,
              For I am nothing, if not critical.    --Shak.
        [1913 Webster]
  
     5. Characterized by thoroughness and a reference to
        principles, as becomes a critic; as, a critical analysis
        of a subject.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
              Our circumstances are indeed critical. --Burke.
        [1913 Webster]
  
              The small moment, the exact point, the critical
              minute, on which every good work so much depends.
                                                    --South.
        [1913 Webster]
  
     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
        Reason."
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

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

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