nestling /ˈnɛstlɪŋ/noun 2/ˈnɛsəlɪŋ/ noun 1forms 1 noun2 •A small, young bird that is still confined to the nest. •(no longer used) A nest; a receptacle.[…] the Secrecies of the Passages; and the seats or neastling of the humours; […] — 1605 nestling /ˈnɛsəlɪŋ/ noun1 •The act of one who nestles. formsnestlings