Definition of Plana. Meaning of Plana. Synonyms of Plana

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Definition of Plana

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Aplanatic focus
Focus Fo"cus, n.; pl. E. Focuses, L. Foci. [L. focus hearth, fireplace; perh. akin to E. bake. Cf. Curfew, Fuel, Fusil the firearm.] 1. (Opt.) A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror. 2. (Geom.) A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant. Note: Thus, in the ellipse FGHKLM, A is the focus and CD the directrix, when the ratios FA:FE, GA:GD, MA:MC, etc., are all equal. So in the hyperbola, A is the focus and CD the directrix when the ratio HA:HK is constant for all points of the curve; and in the parabola, A is the focus and CD the directrix when the ratio BA:BC is constant. In the ellipse this ratio is less than unity, in the parabola equal to unity, and in the hyperbola greater than unity. The ellipse and hyperbola have each two foci, and two corresponding directrixes, and the parabola has one focus and one directrix. In the ellipse the sum of the two lines from any point of the curve to the two foci is constant; that is: AG+GB=AH+HB; and in the hyperbola the difference of the corresponding lines is constant. The diameter which passes through the foci of the ellipse is the major axis. The diameter which being produced passes through the foci of the hyperbola is the transverse axis. The middle point of the major or the transverse axis is the center of the curve. Certain other curves, as the lemniscate and the Cartesian ovals, have points called foci, possessing properties similar to those of the foci of conic sections. In an ellipse, rays of light coming from one focus, and reflected from the curve, proceed in lines directed toward the other; in an hyperbola, in lines directed from the other; in a parabola, rays from the focus, after reflection at the curve, proceed in lines parallel to the axis. Thus rays from A in the ellipse are reflected to B; rays from A in the hyperbola are reflected toward L and M away from B. 3. A central point; a point of concentration. Aplanatic focus. (Opt.) See under Aplanatic. Conjugate focus (Opt.), the focus for rays which have a sensible divergence, as from a near object; -- so called because the positions of the object and its image are interchangeable. Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in which the cathode rays are focused upon the anticathode, for intensifying the effect. Principal, or Solar, focus (Opt.), the focus for parallel rays.
Aplanatism
Aplanatism A*plan"a*tism, n. Freedom from spherical aberration.
Complanar
Complanar Com*pla"nar, a. See Coplanar.
Complanate
Complanate Com"pla*nate (? or ?), a. [L. complanatus, p. p. of complanare to make plane. See Plane, v. t.] Flattened to a level surface. [R.]
Complanate
Complanate Com"pla*nate, v. t. To make level. [R.]
Deplanate
Deplanate De*pla"nate, a. [L. deplanetus, p. p. of deplanare to make level. See Plane, v. t.] (Bot.) Flattened; made level or even.
Diplanar
Diplanar Di*pla"nar, a. [Pref. di- + plane.] (Math.) Of or pertaining to two planes.
Esplanade
Esplanade Es`pla*nade", n. [F. esplanade, Sp. esplanada, explanada, cf. It. spianata; fr. Sp. explanar to level, L. explanare to flatten or spread out. See Explain.] 1. (Fort.) (a) A clear space between a citadel and the nearest houses of the town. --Campbell (Mil. Dict. ). (b) The glacis of the counterscarp, or the slope of the parapet of the covered way toward the country. 2. (Hort.) A grass plat; a lawn. --Simmonds. 3. Any clear, level space used for public walks or drives; esp., a terrace by the seaside.
Explanate
Explanate Ex"pla*nate, a. [L. explanatus, p. p. of explanare. See Explain.] (Bot. & Zo["o]l.) Spreading or extending outwardly in a flat form.
Explanation
Explanation Ex`pla*na"tion, n. [L. explanatio: cf. OF. esplanation.] 1. The act of explaining, expounding, or interpreting; the act of clearing from obscurity and making intelligible; as, the explanation of a passage in Scripture, or of a contract or treaty. 2. That which explains or makes clear; as, a satisfactory explanation. 3. The meaning attributed to anything by one who explains it; definition; interpretation; sense. Different explanations [of the Trinity]. --Bp. Burnet. 4. A mutual exposition of terms, meaning, or motives, with a view to adjust a misunderstanding, and reconcile differences; reconciliation; agreement; as, to come to an explanation. Syn: Definition; description; explication; exposition; interpretation; detail. See Definition.
Explanative
Explanative Ex*plan"a*tive, a. Explanatory.
Explanatoriness
Explanatoriness Ex*plan"a*to*ri*ness, n. The quality of being explanatory.
Explanatory
Explanatory Ex*plan"a*to*ry, a. [L. explanatorius.] Serving to explain; containing explanation; as explanatory notes. --Swift.
Misexplanation
Misexplanation Mis*ex`pla*na"tion, n. An erroneous explanation.
Planaria
Planaria Pla*na"ri*a, n.; pl. L. Planari[ae], E. -rias. [NL. See Planary.] (Zo["o]l.) Any species of turbellarian worms belonging to Planaria, and many allied genera. The body is usually flat, thin, and smooth. Some species, in warm countries, are terrestrial.
Planariae
Planaria Pla*na"ri*a, n.; pl. L. Planari[ae], E. -rias. [NL. See Planary.] (Zo["o]l.) Any species of turbellarian worms belonging to Planaria, and many allied genera. The body is usually flat, thin, and smooth. Some species, in warm countries, are terrestrial.
Planarian
Planarian Pla*na"ri*an, n. (Zo["o]l.) One of the Planarida, or Dendroc[oe]la; any turbellarian worm. -- Pla*na"ri*an, a.
Planarian
Planarian Pla*na"ri*an, n. (Zo["o]l.) One of the Planarida, or Dendroc[oe]la; any turbellarian worm. -- Pla*na"ri*an, a.
Planarida
Planarida Pla*nar"i*da, n. pl. [NL.] (Zo["o]l.) A division of Turbellaria; the Dendroc[oe]la.
Planarioid
Planarioid Pla*na"ri*oid, a. [Planaria + -oid.] (Zo["o]l.) Like the planarians.
Planary
Planary Pla"na*ry, a. [L. planarius level. See Plane, a.] Of or pertaining to a plane. [R.]

Meaning of Plana from wikipedia

- up plana in Wiktionary, the free dictionary. Plana may refer to: plural of Latin word Planum used in planetary geology Giovanni Antonio Amedeo Plana (1781–1864)...
- Planá may refer to places in the Czech Republic: Planá (České Budějovice District), a muni****lity and village in the South Bohemian Region Planá (Tachov...
- José Antonio Plana (born April 19, 1952) is a Cuban-American actor and director. He is known for playing Betty Suarez's father, Ignacio Suarez, on the...
- Castellón de la Plana (officially in Valencian: Castelló de la Plana), or simply Castellón (Valencian: Castelló) is the capital city of the province of...
- The Plana Cays are a group of two small uninhabited islands in the southern Bahama Islands, located east of Acklins Island and west of Mayaguana Island...
- Velika Plana (Serbian Cyrillic: Велика Плана, pronounced [ʋêlikaː plǎːna] ) is a town and muni****lity located in the Podunavlje District of Serbia. As...
- 42°31′N 23°26′E / 42.517°N 23.433°E / 42.517; 23.433 Plana (Bulgarian: Плана) is a mountain range in western Bulgaria, bounded by Sofia Valley to the...
- scientists of his age. The crater Plana on the Moon is named in his honor. Plana was born in Voghera, Italy to Antonio Maria Plana and Giovanna Giacoboni. At...
- Selaginella plana, commonly known as the Asian spikemoss, is a lycophyte native to tropical Asia. Selaginella plana occurs in tropical regions of Asia...
- The pars plana (also known as orbicularis ciliaris ) (Latin: flat portion) is part of the ciliary body in the uvea (or vascular tunic), the middle layer...