phenotype Syllabification: (phe·no·type)Pronunciation: /ˈfēnəˌtīp/Definition of phenotype noun Biology the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment. Derivatives phenotypicPronunciation: /ˌfēnəˈtipik/ adjective phenotypicalPronunciation: /ˌfēnəˈtipikəl/ adjective phenotypicallyPronunciation: /ˌfēnəˈtipik(ə)lē/ adverb Origin: early 20th century: from German Phaenotypus (see pheno-, type)phenotype in other Oxford dictionaries Definition of phenotype in the British & World English dictionary