Entry 1 sense Webster, 1913 Horticultural /hôrˌ-tək-ŭl'-chẽr-əl/ · Hor·ti·cul·tur·al · IPA /hˌɔrtəkˈʌltʃərəl/ 01 a. Of or pertaining to horticulture, or the culture of gardens or orchards. 1. Of or pertaining to horticulture, or the culture of gardens or orchards.