ar·i·o·car·pus \ˌarē(ˌ)ōˈkärpəs, -rēəˈk-\noun Usage: capitalized Etymology: New Latin, from ario- (from Aria section of Sorbus once considered a separate genus of Malaceae, from Greek aria holm oak) + -carpus : a genus of spineless cacti found in Texas and adjacent Mexico consisting of spirally arranged triangular horny tubercles