The Latin form pater familias 'father of the family, looks odd because the genitive of "family" is not familiae as you'd expect. Instead, it's familias, an archaic genitive (possessive) case ending.
From N.S. Gill's Ancient/Classical History Glossary, for About.com
The Latin form pater familias 'father of the family, looks odd because the genitive of "family" is not familiae as you'd expect. Instead, it's familias, an archaic genitive (possessive) case ending.
©2009 About.com, a part of The New York Times Company.
All rights reserved.