MOLLUSCA n.
, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve.
MONTESSORI METHOD n.
ity (no stationary desks and chairs), informal and individual instruction, the very early development of writing, and an extended sensory and motor training (with special emphasis on vision, touch, perception of movement, and their interconnections), mediated by a patented, standardized system of "didactic apparatus,"…
MULTICENTRAL a.
Having many, or several, centers; as, a multicentral cell. Multicental development (Biol.), growth, or development, from several centers. According as the insubordination to a single center is more or less pronounced, the resultant organism will be more or less irregular in form and may even discontinuous.…