High School Earth Science/Geologic Time Scale - Lesson Summary. 1  The Earth is very old, and the study of Earth's past requires us to think about times that were millions or even billions of years ago. Scientists use the geologic time scale to illustrate the order in which events on Earth have happened.
Medical Definition of intraocular pressure. : the pressure within the eyeball that gives it a round firm shape and is caused by the aqueous humor and vitreous body.
Abbreviation: CIP. A complication occurring in patients in intensive care in which failure to wean from mechanical ventilation is associated with distal limb weakness, loss of distal sensation from light touch or pinprick, and diminished reflexes; facial muscles and nerves are spared.