Which prefix means 'under', 'below', or 'beneath'?

The prefix that means 'under', 'below', or 'beneath' is 'Sub-'. This prefix is widely used in medical terminology to describe anatomical locations or conditions that are situated below or underneath something else. For instance, the term 'subcutaneous' refers to something situated or occurring beneath the skin, while 'subdural' describes a space located beneath the dura mater of the brain.

This understanding is crucial for medical professionals, as it helps in accurately conveying information about patient conditions and anatomical structures. The other prefixes have different meanings. For example, 'Hypo-' generally refers to something that is lower than normal or insufficient, 'Pachy-' indicates thickness, and 'Pano-' refers to everything or all. Thus, the correct connection to mean 'under', 'below', or 'beneath' is indeed through the prefix 'Sub-'.