Definition of "center of mass" []

• The point in a system of bodies or an extended body at which the mass of the system may be considered to be concentrated and at which external forces may be considered to be applied. Also called barycenter, centroid. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Argelos’ first salvo breached the hull, and moments later Ky’s and Pettygrew’s met in the center of mass and blew it apart."