Entry 1 sense Webster, 1913 Bois d'arc · Bois· d'arc · IPA /ˈboʊˌdɑɹk/ 01 The Osage orange (Maclura aurantiaca). 1. The Osage orange (Maclura aurantiaca).(Bot.) “The bois d'arc seems to be the characteristic growth of the black prairies.” — U. S. Census (1880).