Which morpheme indicates 'under' in the word 'hypothermia'?

The morpheme that indicates 'under' in the word 'hypothermia' is 'hypo.' In this context, 'hypo-' is a prefix derived from Greek, meaning 'under' or 'below.' It modifies the root word 'therm,' which refers to heat, to indicate a condition of having lower than normal body temperature.

The combination of these morphemes communicates a specific medical condition, where 'hypo-' denotes a deficiency of heat or temperature. Understanding morphemes, particularly prefixes and their meanings, is crucial in deciphering medical terminology and other complex words in English.