at·ra·bil·ious (ăt′rə-bĭlyəs) also at·ra·bil·i·ar (-bĭlē-ər)
1. Inclined to melancholy.
2. Having a peevish disposition; surly.
[From Latin ātra bīlis, black bile (translation of Greek melankhōliā) : ātra, black; see āter- in the Appendix of Indo-European roots + bīlis, bile.]
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.