What is indicated by the prefix 'sub-'?

The prefix 'sub-' means 'below' or 'under.' It is commonly used in medical terminology to describe structures or conditions that are situated beneath another structure or lower than a particular level. For example, the term 'subcutaneous' refers to the layer of tissue that is located beneath the skin. Understanding this prefix helps in interpreting various medical terms and their meanings, making it an essential component of medical vocabulary.

Other choices, while potentially relevant in different contexts, do not accurately reflect the meaning of 'sub-.' The prefix indicating 'above' would typically be 'super-' or 'supra-,' and 'within' suggests the prefix 'intra-,' while 'near' might be indicated by prefixes like 'para-' or 'pro-.' Knowing these distinctions allows for better comprehension of medical language and its precise meanings.