1580s (earlier in various Latin and French phrases), from Latin per "through, during, by means of, on account of, as in," from PIE root *per- (1) "forward," hence "through, in front of, before, first, chief, toward, near, around, against."
peptic
peptide
peptone
*per-
per-
per
per annum
per capita
per diem
per se
per stirpes
