patriarchn.[F. patriarche, L. patriarcha, Gr. paria`rchhs, fr. paria` lineage, especially on the father's side, race; path`r father + 'archo`s a leader, chief, fr. 'a`rchein to lead, rule. See Father, Archaic.]1. The father and ruler of a family; one who governs his family or descendants by paternal right; -- usually applied to heads of families in ancient history, especially in Biblical and Jewish history to those who lived before the time of Moses.()2. (R. C. Ch. & Gr. Ch.) A dignitary superior to the order of archbishops; as, the patriarch of Constantinople, of Alexandria, or of Antioch.()3. A venerable old man; an elder. Also used figuratively.()The patriarch hoary, the sage of his kith and the hamlet. (Longfellow.)The monarch oak, the partiarch of trees. (Dryde.)