retrogradation /.retrәgrә'deiʃәn/ 📖 中文释义 n. 逆行, 退化, 倒退[机] 退减作用 🔗 释义中的汉语词 逆行退化倒退 📘 English Definition（英文释义） n. The act of retrograding, or moving backward.n. The state of being retrograde; decline. ← retrognathia retrograde →