Which prefix suggests a condition that is 'excessive'?

The prefix that suggests a condition that is 'excessive' is hyper-. This prefix originates from the Greek language and is commonly used in medical terminology to indicate an above-normal level or an excessive amount of something. For example, in terms like hypertension, hyperglycemia, or hyperactivity, it indicates that the condition is marked by an excessive amount or an abnormal increase of blood pressure, glucose levels, or activity, respectively.

In contrast, the other prefixes offer differing meanings. Homo- typically refers to sameness or similarity, hetero- denotes difference or otherness, and eu- signifies good, normal, or well. Thus, hyper- is distinctly associated with excess, making it the appropriate choice for this question regarding excessive conditions.