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Metals (Implant): Strong and relatively ductile substances that provide electropositive ions to a corrosive environment and can be polished to a high luster, characterized by metallic atomic bonding. Most oft . . . View Full Definition

Metamorphism: The changes of mineralogy and texture imposed on a rock by pressure and temperature in the Earth's interior. Meteoric water: Rainwater, snow, hail, and sleet.

Metallurgy: The science explaining the properties, behavior and internal structure of metals.

Metalloid: An element with both metallic and nonmetallic properties. Examples are silicon, arsenic, and germanium.

Metallophone: Percussion instrument consisting of tuned metal bars, usually struck with a mallet.

Metamorphosis: The process of changing from one form to another; e.g., in insects, from the larval stage to the pupal stage to the reproductive adult stage.

Metaphase: The stage of eukaryotic cell division (mitosis or meiosis) in which the chromosomes line up at the equator of the cell.

Metapoetry: Poetry about poetry, especially self-conscious poems that pun on objects or items associated with writing or creating poetry. Among the Romantic and Enlightenment poets, we find puns on leav . . . View Full Definition

Metapopulation: A group of interconnected subpopulations, usually of subequal size. The features of individuals now founnd in one subpopulation might have been determined by conditions affecting them when t . . . View Full Definition