cosecant

[Eng. co, a contraction for complement first introduced by Gunter, and secant (q. v.).] Geom.: The secant of the complement of an arc or angle-i. e., the secant of the arc or angle nece ary to make the cosecant the other one up to 90°. Let ac be a quadrant, then the arcs A E and E C are complements of each other; so also are the angles A BE and EBC. LetcDbe a tangent to the quadrant or the circle of B which it constitutes a part, then BD is the Cosecant. E secant of the arc ECor the angle EB C, and the cosecant of the are E A or the angle E B А. co-seis-mal, a. & 8. [Lat.co=together, and Gr. seismos=an earthquake.] A. As adj.: Pertaining to the line described under B. B. As subst.: The line in which a "wave shell" reaches the earth at the same time. (Ro iter.) [SEISMOLOGY.]