How many syllables in phenolphthalein?

There are 4 syllables in the word phenolphthalein.

How to pronounce phenolphthalein:

phenolphthalein (noun):: a white or yellowish-white crystalline compound c20h14o4 used in analysis as an indicator because its solution is brilliant red in alkalies and is decolorized by acids and in medicine as a laxative; 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.

laxative

Here are some other common words that have 4 syllables, like phenolphthalein does.

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