nature-deficit disorder UK /ˈneɪtʃə ˈdɛfɪsɪt dɪsˈɔːdə(ɹ)/US /ˈneɪtʃɚ ˈdɛfəsɪt dɪsˈɔːɹdɚ/ noun1 •A disputed class of behavioural problems in modern children, ascribed to the fact that they spend little time outdoors. formsnature deficit disorders · nature-deficit disorders