Entry 1 sense Webster, 1913 Horticulturist /hôrˌ-tĭk-ŭl'-chẽr-ĭst/ · Hor·ti·cul·tur·ist · IPA /hˌɔrtɪkˈʌltʃərɪst/ 01 n. One who practices horticulture. 1. One who practices horticulture.