DESUETUDE

[ dɪ'sju:ɪtju:d , 'dɛswɪ- ]

■ noun formal a state of disuse.

Origin

C17 (in the sense 'cessation'): from Fr., from L. desuetudo , from desuet- , desuescere 'make unaccustomed', from de- (expressing reversal) + suescere 'be accustomed'.