ˈevənz- noun
Usage: usually capitalized E
Etymology: after Herbert M. Evans died 1971 American anatomist
: a disazo dye C 34 H 24 N 6 Na 4 O 14 S 4 that is obtained as a green, bluish green, or brown powder and that on injection into the blood stream combines with serum albumin and serves as a means of determining blood volume colorimetrically