1. moving or directed or tending in a backward direction or contrary to a previous direction; [syn: retral, retrograde]
2. at or near or toward the posterior;
WordNet (r) 3.0 (2006):
retral
adj 1: moving or directed or tending in a backward direction or
contrary to a previous direction [syn: retral,
retrograde]
2: at or near or toward the posterior