Hypertext Webster Gateway: "Diurna"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Diurna \Di*ur"na\, n. pl. [NL., fr. L. diurnus belonging to the
day.] (Zo["o]l.)
A division of Lepidoptera, including the butterflies; -- so
called because they fly only in the daytime.
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