Retrogressive
Pronunciation : Re`tro*gres"sive
Part of Speech : a.
Etymology : [Cf. F. r?trogressif.]
Definition : 1. Tending to retrograde; going or moving backward; declining from a better to a worse state.
2. (Biol.)
Defn: Passing from a higher to a lower condition; declining from a more perfect state of organization; regressive.
Source : Webster's Unabridged Dictionary, 1913