(geodynamics, tectonics) A proposed driving force for plate motion in plate tectonics that occurs at mid-ocean ridges as the result of the rigid lithosphere sliding down the hot, raised asthenosphe...

Third-person singular simple present indicative form of ring up

(US, medicine, healthcare) Medical services which are planned, directed, and controlled—especially by a health insurance company—in a manner designed to maximize the efficiency of the delivery and ...

Third-person singular simple present indicative form of hill