esti f (plural estis) 1  Alternative form of. â 2 estiâ in le TrÃ©sor de la langue franÃ§aise informatisÃ© (The Digitized Treasury of the French Language).
Frame dragging is a theory which says that space is elastic, and particles in it will exchange energy with it. In the scientific world, elastic means that when you apply a certain amount of force to an object (which will cause it to bend) and then remove the force, the object will return to its original shape and energy state.
A drag link is an outdated piece of steering linkage found on utility vehicles like trucks and jeeps. And it's held on with a big-ass machine screw. Drag link sockets are therefore just huge hollow-ground bits with a female end that accepts the square drive of a socket wrench, to get the drag links off. Once I had the appropriate term to Google, I found they're still made and sold by a lot of different manufacturers.