tyrannuletPronunciation: /tʌɪˈranjʊlɪt/Definition of tyrannulet noun a small tropical American bird of the tyrant flycatcher family, typically with drab greyish or greenish plumage. Family Tyrannidae: several genera and many species Origin:diminutive based on modern Latin Tyrannus (genus name), from Greek turannos 'tyrant'tyrannulet in other Oxford dictionaries Definition of tyrannulet in the US English dictionary