What is the meaning of the prefix pht/o?

The prefix "pht/o" refers to "light." It is derived from the Greek word "phos," which means light, and is often used in medical terminology and other scientific fields to denote matters related to light. For example, terms like "phototherapy" relate to treatment using light.

The concept of "pht/o" as "light" can be observed in various contexts involving processes or treatments that utilize light in some way, such as visual examinations or therapeutic applications. Understanding this prefix can enhance comprehension of numerous medical terms, particularly those associated with vision or treatments involving light.

The other choices do not align with the meaning of "pht/o"; plant, pathogen, and fluid represent completely different concepts that do not share the association of light.