|Compare foreshock one of a series of minor tremors occurring
after the main shock of an earthquake| |a screen or mat covered
with a dark material for shielding a camera lens from excess
light or glare.| |a gadget; dingus; thingumbob.| |aftershock
(āf'tər-shŏk') Pronunciation Key A less powerful earthquake that
follows a more forceful one. Aftershocks usually originate at or
near the focus of the main earthquakes they follow and can
continue for days or months. They usually decrease in magnitude
and frequency with time.