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Avellaneda

(Encyclopedia)Avellaneda ävāyänāˈᵺä [key], city, Buenos Aires prov., E central Argentina, across the Riachuelo River from the Buenos Aires federal district. It is one of the mos...

Nicol prism

(Encyclopedia)Nicol prism nĭkˈəl [key], optical device invented (1828) by William Nicol of Edinburgh. It consists essentially of a crystal of calcite, or Iceland spar, that is cut at an angle into two equal piec...

Avellaneda, Nicolás

(Encyclopedia)Avellaneda, Nicolás nēkōläsˈ ävāyänāˈᵺä [key], 1837–85, Argentine statesman, president of the republic (1874–80). As minister of justice, religion, and public instruction under Doming...

Gómez de Avellaneda, Gertrudis

(Encyclopedia)Gómez de Avellaneda, Gertrudis hĕrtro͞oˈᵺēs gōˈmĕth dā ävĕlyänāˈᵺä [key], 1814–73, Spanish poet, b. Cuba. She went to Spain in 1836. Her passionate and poignant verses reflecting ...

Avellaneda, Alonso Fernández de

(Encyclopedia)Avellaneda, Alonso Fernández de älônˈsō fārnänˈdāth dā ävĕlyänāˈᵺä [key], pen name used by the unknown Spanish writer who published a spurious second part of Don Quixote in 1614, bef...

Iceland spar

(Encyclopedia)Iceland spar, colorless variety of crystallized calcite, characterized by its properties of transparency and double refraction. It is used chiefly in the manufacture of Nicol prisms, which are essenti...

prism

(Encyclopedia)prism, in optics, a piece of translucent glass or crystal used to form a spectrum of light separated according to colors. Its cross section is usually triangular. The light becomes separated because d...

Epirus, despotate of

(Encyclopedia)Epirus, despotate of. When, in 1204, the army of the Fourth Crusade set up the Latin Empire of Constantinople on the ruins of the Byzantine Empire, an independent Greek state emerged in Epirus under M...

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