minilecture means A short lecture.
Etymology
From mini- + lecture.
noun
- A short lecture.“After hearing a minilecture on how plants are converted into sugars, and the sugars then distilled into fuel, Mr. Bush, a former Texas oilman who has proclaimed Americans “addicted to oil,” lifted up a glass beaker of switchgrass, a perennial grass that looks like hay, and stared into a bank of television cameras to drive his point home.”