%metabasis%

n.; pl. Metabases [ NL., fr. Gr. &unr_;, fr. &unr_; to pass over; &unr_; beyond, over + &unr_; to go. ] 1. (Rhet.) A transition from one subject to another. [ 1913 Webster ]

2. (Med.) Same as Metabola. [ 1913 Webster ]