from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of genethliac.
from the GNU version of the Collaborative International Dictionary of English
- n. The science of calculating nativities, or predicting the future events of life from the stars which preside at birth.
Sorry, no etymologies found.
If one endeavor to know the future by observing the position and movements of the stars, this belongs to "astrologers," who are also called "genethliacs," because they take note of the days on which people are born.