ICOSITETRAHEDRON n.
. A suffix used in forming the names of certain sciences, systems, etc., as acoustics, mathematics, dynamics, statistics, politics, athletics.
IMAGE n.
essels projected in, not merely on, that membrane. -- Virtual image (Optics), a point or system of points, on one side of a mirror or lens, which, if it existed, would emit the system of rays which actually exists on the other side of the mirror or lens. Clerk Maxwell.