The doctor said his father's temporary speech loss and weakness were caused by mini-strokes.

mini-strokes 是由前缀 mini-（表示"微小的"）和名词 strokes（中风）组成的复合词。stroke 指"中风"，即脑部血液供应突然中断导致的脑损伤。mini-strokes 字面意思是"微小型中风"，医学上称为"短暂性脑缺血发作"，症状较轻且持续时间较短。