li·bi·do (lĭ-bēdō, -bī-)
n. pl. li·bi·dos
1. The psychic and emotional energy associated with instinctual biological drives.
a. Sexual desire.
b. Manifestation of the sexual drive.
[Latin libīdō, desire; see leubh- in the Appendix of Indo-European roots.]
li·bidi·nal (-bĭdn-əl) adj.
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:
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.