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The combining form used for "fungus" in medical terminology is myc/o. This prefix originates from the Greek word "mykes," meaning fungus. In medical contexts, it is often seen in words such as mycology, which is the study of fungi, and mycosis, referring to a disease caused by a fungal infection. Understanding this root is essential for medical professionals as it aids in recognizing and interpreting terms related to fungal diseases and treatments.

In contrast, the other options represent different combining forms: lip/o refers to fat, kerat/o pertains to the cornea or a hard substance, and gnos/o relates to knowledge or recognition, particularly in diagnostic contexts. Therefore, these options do not apply to the concept of fungus.