phenotypePronunciation: /ˈfiːnə(ʊ)tʌɪp/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: /-ˈtɪpɪk/ adjective phenotypicalPronunciation: /-ˈtɪpɪk(ə)l/ adjective phenotypicallyPronunciation: /-ˈtɪpɪk(ə)li/ adverb Origin: early 20th century: from German Phaenotypus (see pheno-, type)phenotype in other Oxford dictionaries Definition of phenotype in the US English dictionary