bromsulphalein
noun
brom·sul·pha·lein ¦brōm-ˌsəl-ˈfa-lē-ən 
-səl-,
-ˈfā-
variants or Bromsulphalein
medical
: a dye C20H10Br4O10S2 derived from phenolphthalein that is used in the form of its bitter white crystalline disodium salt in a liver function test
Word History
Etymology
shortened and altered from phenoltetrabromphthalein sodium sulphonate
Note: Term probably introduced by Sanford M. Rosenthal and Edwin C. White in "Clinical application of the bromsulphalein test for hepatic function," Journal of the American Medical Association, vol. 84, no. 15 (April 11, 1925), pp. 1112-14.