[pen-tuh-priz-uh m] /ˈpɛn təˌprɪz əm/
a that has five faces, a pair of which are at 90° to each other; a ray entering one of the pair emerges from the other at an angle of 90° to its original direction: used especially in single-lens reflex cameras to reverse images laterally and reflect them to the viewfinder.
a five-sided prism that deviates light from any direction through an angle of 90°, typically used in single-lens reflex cameras between lens and viewfinder to present the image the right way round
[pen-tap-tik] /ˈpɛn tæp tɪk/ noun 1. a work of art consisting of five panels or sections.
/ˈpɛntəˌkwɑːk/ noun 1. (physics) a postulated subatomic particle consisting of four quarks and one antiquark, thought not to exist in actuality
pentaquine pen·ta·quine (pěn’tə-kwēn’, -kwĭn) or pen·ta·quin (-kwĭn) n. A synthetic drug used with quinine in the prevention or treatment of malaria.
[pen-tahr-kee] /ˈpɛn tɑr ki/ noun, plural pentarchies. 1. a government by five persons. 2. a governing body of five persons. 3. a federation of five nations, each under its own government or ruler. /ˈpɛntɑːkɪ/ noun (pl) -chies 1. government by five rulers 2. a ruling body of five 3. a union or association of five […]