diurna

1 definition found

diurna - Collaborative International Dictionary of English v.0.48 :

  Diurna \Di*ur"na\, n. pl. [NL., fr. L. diurnus belonging to the
     day.] (Zool.)
     A division of Lepidoptera, including the butterflies; -- so
     called because they fly only in the daytime.
     [1913 Webster]