What is the medical term meaning mini-stroke?

Answer 1

What most think of as ministrokes are called transient ischemic attacks in medical terms.
Often transient ischemic attacks (TIAs) are called mini strokes, though this is somewhat of a misnomer since in TIAs don't cause permanent damage to the brain, while strokes do.

Answer 2

A "mini-stroke" is a laymans term for a Transient Ischaemic Attack (TIA). It is symptomatically similar to a "full stroke" (CVA), but in a TIA, symptoms resolve within 24 hours.