A lenticular galaxy is a type of galaxy which is intermediate between an elliptical galaxy and a spiral galaxy in galaxy morphological classification schemes. Lenticular galaxies are disc galaxies (like spiral galaxies) which have used up or lost most of their interstellar matter and therefore have very little ongoing star formation. They may, how...
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http://en.wikipedia.org/wiki/Lenticular_galaxy
a galaxy possessing a large bulge and small disk.
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http://planetfacts.org/space-terms/
(from the article `Cosmos`) ...two subcategories: ordinary spirals, denoted S, and barred spirals, denoted SB. In addition, there exists a transition type between ellipticals ...
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http://www.britannica.com/eb/a-z/l/34
NGC 5866 in Draco. Hubble Space Telescope image A galaxy with a central bulge and disk but apparently lacking spiral arms and substantial amounts of interstellar material. Lenticular galaxies are so named because of their lens-like appearance when seen edge-on. In the Hubble scheme of galaxy cla...
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http://www.daviddarling.info/encyclopedia/L/lenticular_galaxy.html
A disk-shaped galaxy that contains no conspicuous structure within the disk. Lenticular galaxies tend to look more like elliptical galaxies than spiral galaxies.
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http://www.seasky.org/astronomy/astronomy-glossary.html
An intermediate form of galaxy, between elliptical galaxies and spiral galaxies. They possess flattened forms and galactic discs but have no spiral arms. See also: Galaxy.
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https://www.encyclo.co.uk/local/20687
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