SECONDARY a.
through the optical center of a lens but not through the centers of curvature, or, in the case of a mirror, which passes through the center of curvature but not through the center of the mirror. -- Secondary battery. (Elec.) See under Battery, n., 4. -- Secondary circle (Geom. & Astron.), a great circle passes throug…
SEGMENTATION n.
ryos of all the higher plants and animals are derived from the germ cell. In the simplest case, that of small ova destitute of food yolk, the ovum or egg divides into two similar halves or segments (blastomeres), each of these again divides into two, and so on, thus giving rise to a mass of cells (mulberry mass, or mor…