By Mayo Clinic Staff. Erectile dysfunction â the inability to get and keep an erection firm enough for sex â is a common problem. You've likely seen advertisements for erectile dysfunction herbs or supplements to increase your sexual performance..
plate tectonics. In geology, a theory that the Earth's lithosphere (crust and upper mantle) is divided into a number of large, plate-like sections that move as distinct masses. See Notes at fault, Gondwanaland, See more at tectonic boundary.
A plate is a round or oval flat dish that is used to hold food. Anita pushed her plate away; she had eaten virtually nothing. A plate of food is the amount of food on the plate. ...a huge plate of bacon and eggs. A plate is a flat piece of metal, especially on machinery or a building. A plate is a small, flat piece of metal with someone's name written on it, which you usually find beside the front door of an office or house.