What does '-phasia' mean in a medical context?

In a medical context, the suffix '-phasia' specifically refers to speech. It is derived from the Greek word 'phasis,' which means 'speech' or 'saying.' This term is often used in relation to various speech disorders, such as aphasia, which is a condition that affects a person's ability to communicate. The use of '-phasia' in medical terminology highlights its focus on language capabilities, encompassing both the production and understanding of speech.

The other terms in the choices refer to different concepts altogether. Movement is associated with terms like '-kinesia,' color relates to '-chromia,' and vision involves terms like '-opia.' Thus, these options do not pertain to speech, underscoring why the correct answer is focused on the aspect of communication.