Etymology
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os- 
frequent form of ob- before -c- and -t- in words from Latin.
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hypso- 
word-forming element meaning "height," from Greek hypsos "height, top," from PIE *upso-, from root *upo "under," also "up from under," hence also "over" The Greek word is cognate with Sanskrit os "above, over," Old Church Slavonic vysoku "high."
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osteo- 
before vowels oste-, word-forming element meaning "bone, bones," from Greek osteon "bone," from PIE root *ost- "bone."
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