The Collaborative International Dictionary of English v.0.48:
Paterfamilias \Pa`ter*fa*mil`i*as\, n.; pl. Pateresfamilias. [L., fr. pater father + familias, gen. of familia family.] (Rom. Law) The head of a family; in a large sense, the proprietor of an estate; one who is his own master. [1913 Webster]WordNet (r) 3.0 (2006):
paterfamilias n 1: the male head of family or tribe [syn: patriarch, paterfamilias]