\Green"let\, n. l. (Zo["o]l.) One of numerous species of small American singing birds, of the genus {Vireo}, as the solitary, or blue-headed ({Vireo solitarius}); the brotherly-love ({V. Philadelphicus}); the warbling greenlet ({V. gilvus}); the yellow-throated greenlet ({V. flavifrons}) and others. See {Vireo}. 2. (Zo["o]l,) Any species of {Cyclorhis}, a genus of tropical American birds allied to the tits.