Which prefix is defined as large or great in the source material?

• A. Macro-
• B. Mega-
• C. Megalo-
• D. Olig/o

Answer: (B)

Understanding prefixes that convey size helps you decode medical terms. Mega- comes from Greek megas meaning large or great, and it functions as a multiplying prefix to signal something of very large size (for example, a megabyte or a megawatt). In the source material, this exact sense—large or great—is assigned to mega-, so it fits the prompt perfectly. While macro- also means large, the material specifically defines mega- as the term for “large or great.” Megalo- denotes enlargement in some medical terms, often with a nuance of abnormal size, and olig/o means few.