Semidiurnal

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Semidiurnal \Sem`i*di*ur"nal\, a.
     1. Pertaining to, or accomplished in, half a day, or twelve
        hours; occurring twice every day.
        [1913 Webster]
  
     2. Pertaining to, or traversed in, six hours, or in half the


        time between the rising and setting of a heavenly body;
        as, a semidiurnal arc.
        [1913 Webster]