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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Hippocampus – For this word:  he “i” is short, the “pp” combination is pronounced simply like the single letter “p” (this is the standard pronunciation of this letter combination in The Common Tongue), the “o” is long, the “c” is hard, the “a” is short, and the “u” turns into an i-schwa.

– /hih-poh-KæM-pihs/ – /ˌhɪ.po.ˈkæm.pə(ɪ)s/ – Notice also that there is a minor stress on the first syllable and that the major stress is on the separate syllable –

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Learn More About The Word “Hippocampus” On Wiktionary

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