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The term that refers to 'two' in medical terminology is "di-." This prefix is commonly used in various medical terms to indicate a double or twofold condition. For instance, "diplopia" refers to double vision, and "diabetes" originally indicated a condition characterized by the excessive passage of urine, implying a duality in a certain context. While "bi-" is often associated with 'two' as well, in medical terminology, "di-" is the more accurate term to denote this concept. Other prefixes such as "tri-" refer to 'three,' and "mono-" indicates 'one,' thus clarifying the specific meaning for 'two' in the context of medical language.