What is the meaning of the prefix 'Mid-'?

The prefix 'Mid-' is derived from Old English and means 'middle' or 'in the middle of.' In medical terminology and various other fields, it is used to denote something that occurs at the center or halfway point of an event, period, or measurement. For example, terms like "midcentral" refer to a position that is central or in the middle.

The other options do not accurately reflect the meaning of 'Mid-.' The prefix that signifies 'after' would typically be ‘post-,’ while 'outside' is associated with prefixes like 'exo-' or 'ecto-,' and 'parasitic' does not correspond with a common prefix in English that denotes position or location. Thus, 'Mid-' appropriately translates to 'middle,' making the correct answer valid in a medical and linguistic context.