pEtra a. ( trI f. ) [ pituridaM aR ] 1 Relating to a father or ancestors ( pb ) generally, paternal, ancestral. 2 Sacred to the Manes. — traM 1 The part of the hand between the forefinger and the thumb. (Also pEtrpa in this sense). 2 A year, month, or day sacred to the Pitṛs.