Etymology -- infra and hypo

In English there are three prefixes that mean "below"; one of them is "sub"; what are the other two?

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Answer: infra and hypo

For example: (i) that which is below zero is sub-zero, (ii) sound waves that have a frequency below the level of human hearing are infrasonic, and (iii) that which grows below ground is hypogeal.

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What about "under-" as in undervote, undersell, underbid, undersupply, etc? English has plenty of prefixes of Anglo-Saxon origin, besides the well-known Greek and Latin ones.

x-Charles H. Bennett

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