continuous surface mirror
71navigation — navigational, adj. /nav i gay sheuhn/, n. 1. the act or process of navigating. 2. the art or science of plotting, ascertaining, or directing the course of a ship, aircraft, or guided missile. [1520 30; < L navigation (s. of navigatio) a voyage.… …
72Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
73publishing, history of — Introduction an account of the selection, preparation, and marketing of printed matter from its origins in ancient times to the present. The activity has grown from small beginnings into a vast and complex industry responsible for the… …
74List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general …
75Cell — The basic structural and functional unit in people and all living things. Each cell is a small container of chemicals and water wrapped in a membrane. Each cell in the human body there are 100 trillion cells in each of us contains the entire… …
76Mirrorless interchangeable-lens camera — MILCs feature a large sensor in a small body (Olympus PEN E P2) A mirrorless interchangeable lens camera (MILC) is an emerging class of digital system cameras, intermediate between compact digital cameras and digital single lens reflex cameras… …
77Lithography — Charles Marion Russell s The Custer Fight (1903). Note the range of tones, fading toward the edges …
78calligraphy — calligrapher, calligraphist, n. calligraphic /kal i graf ik/, calligraphical, adj. calligraphically, adv. /keuh lig reuh fee/, n. 1. fancy penmanship, esp. highly decorative handwriting, as with a great many flourishes: She appreciated the… …
79plasma — plasmatic /plaz mat ik/, plasmic, adj. /plaz meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. cytoplasm. 3. whey. 4. a green, faintly translucent chalcedony. 5. Physics. a …
80laser — /lay zeuhr/, n. Physics. a device that produces a nearly parallel, nearly monochromatic, and coherent beam of light by exciting atoms to a higher energy level and causing them to radiate their energy in phase. Also called optical maser. [1955 60; …
