Table of Contents
Antonyms
Synonyms
1. phenolphthalein
noun. ['ˌfiːnɑːlfˈθeɪlən, ˌfɛnɑːlfˈθeɪlən'] a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8.