a combining form meaning “father,” occurring originally in loanwords from Greek and Latin (patriarch; patrician), and used in the formation of new compounds (patrilineal ).
Also especially before a vowel, patr-.
Origin of patri-
combining form representing Latin pater, Greek patḗr father
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for patri-
from Latin pater, Greek patēr father
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
word-forming element used to make terms describing kinship of the father or the paternal line, from Latin patri-, comb. form of pater (see father (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper