What does sub- mean?

• A. Under, Below
• B. Good, Normal
• C. Within, Inside
• D. Above or Excessive

Answer: (A)

Sub- is a Latin prefix that signals position beneath or under something. In medical terms, it shows that something is located under or below another structure, or is lower in degree or level. For example, subcutaneous means under the skin, and sublingual means under the tongue. This helps you recognize why this prefix means under or below, rather than good or normal (eu-), within or inside (intra- or endo-), or above or excessive (supra- or hyper-). So the meaning under, below is the best fit.