bis-

pref.

Two; twice:bisalbuminemia.
Having two identical but separated complex chemical groups in one molecule:1,4-bis(5-phenyloxazol-2-yl)-benzene.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.