{ } a. [ Gr. seismo`s an earthquake, from sei`ein to shake. ] Of or pertaining to an earthquake; caused by an earthquake. [ 1913 Webster ]

Seismic vertical, the point upon the earth's surface vertically over the center of effort or focal point whence the earthquake's impulse proceeds, or the vertical line connecting these two points. [ 1913 Webster ]

n. [ Gr. &unr_; earthquake + -gram. ] (Physics) The trace or record of an earth tremor, made by means of a seismograph. [ Webster 1913 Suppl. ]

n. [ Gr. &unr_;&unr_;&unr_; an earthquake + -graph. ] (Physics) An apparatus for registering the shocks and undulatory motions of earthquakes. [ 1913 Webster ]

a. Of or pertaining to a seismograph; indicated by a seismograph. [ 1913 Webster ]

n. 1. A writing about, or a description of, earthquakes. [ 1913 Webster ]

2. The art of registering the shocks and undulatory movements of earthquakes. [ 1913 Webster ]

a. Of or pertaining to seismology. -- Seis`mo*log"ic*al*ly, adv. [1913 Webster]

n. [ Gr. &unr_;&unr_;&unr_; an earthquake + -logy. ] The science of earthquakes. [ 1913 Webster ]

n. [ Gr. &unr_;&unr_;&unr_; an earthquake + -meter. ] (Physics) An instrument for measuring the direction, duration, and force of earthquakes and like concussions. [ 1913 Webster ]

a. Of or pertaining to seismometry, or seismometer; as, seismometric instruments; seismometric measurements. [ 1913 Webster ]

n. The mensuration of such phenomena of earthquakes as can be expressed in numbers, or by their relation to the coordinates of space. [ 1913 Webster ]