Dictionary
co•seis•mal
Pronunciation: (kō-sīz'mul, -sīs'-), [key]—
adj.
of, pertaining to, or being in a line, curve, etc., connecting or comprising points on the earth's surface at which an earthquake wave arrives simultaneously.
Also,co•seis'mic.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.