motor neuron disease
noun [ U ] medical UK uk/ˌməʊ.tə ˈnjʊə.rɒn dɪˌziːz/ us/ˈmoʊ.t̬ɚ ˈnʊr.ɑːn dɪˌziːz/ (also motor neurone disease); (US ALS, Lou Gehrig's disease)
运动神经元病
a serious disease that affects the nerve cells and causes the muscles to become weaker and smaller