The Collaborative International Dictionary
Metabases
Metabasis \Me*tab"a*sis\, n.; pl. Metabases. [NL., fr. Gr. ?, fr. ? to pass over; ? beyond, over + ? to go.]
(Rhet.) A transition from one subject to another.
(Med.) Same as Metabola.
Wiktionary
metabases
n. (plural of metabasis English)