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la·dy·bug (lādē-bŭg)
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n.
Any of numerous small, rounded, usually colorful beetles of the family Coccinellidae, often reddish with black spots and feeding primarily on other insects, including pests such as scale insects and aphids. Also called lady beetle, ladybird.

[Probably from its seven spots being considered a symbol of the seven sorrows of the Virgin Mary.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.