Etymology
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ladybug (n.)

also lady-bug, 1690s, from lady + bug (n.). The "lady" is the Virgin Mary (compare German cognate Marienkäfer). In Britain, usually ladybird or lady-bird (1670s), supposedly through aversion to the word bug due to overtones of sodomy, however this seems to be the older form of the word. Also known 17c.-18c. as lady-cow or lady-fly.

updated on April 26, 2016

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Definitions of ladybug from WordNet

ladybug (n.)
small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests;
Synonyms: ladybeetle / lady beetle / ladybird / ladybird beetle
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.