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  1.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Sideral \Sid"er*al\, a. [L. sideralis. See Sidereal.] 1. Relating to the stars. [1913 Webster]

    2. (Astrol.) Affecting unfavorably by the supposed influence of the stars; baleful. "Sideral blast." --Milton. [1913 Webster]