Etymology
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ladybird (n.)

also lady-bird, 1590s, "sweetheart," a term of endearment, from lady + bird (n.2). As the name of a type of beetle, 1670s, the earlier form of ladybug.

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Definitions of ladybird

ladybird (n.)
small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests;
Synonyms: ladybug / ladybeetle / lady beetle / ladybird beetle
From wordnet.princeton.edu