pɹəpɐtˈɛɹætʃd hɐz æz ɪts ɹˈuːt wˈɜːd, ðɪ ˈɪŋɡlɪʃ "pɹˈɑːp"... "ˈæɾɛɹ" ɪz ɪkwˈɪvələnt tʊ ˈɪŋɡlɪʃ "ˈɜː", ænd "ˈiːtʃd" ɪz pɚhˈæps ɪkwˈɪvələnt tuː "ˈɪŋ".
Propataireachd has as its root word, the English "prop"... "-atair" is equivalent to English "-er", and "-eachd" is perhaps equivalent to "-ing".