Lenticular-galaxy meaning

A galaxy having a central bulge surrounded by a flattened disk that contains numerous stars but relatively little interstellar matter, creating a conspicuous pattern of spiral arms.
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A galaxy having a central bulge surrounded by a flattened disk with no pattern of spiral arms. Lenticular galaxies are intermediate in the Hubble classification system between elliptical and spiral forms and are classified using the designation S0, or SB0 if they have a bar of stars, gas, and dust through the nucleus. Like spiral galaxies, they are disk-shaped with a central bulge, but like elliptical galaxies they contain relatively little gas and dust.
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(astronomy) A galaxy that like spiral galaxies has a flat disk but unlike them has lost most of its interstellar matter and therefore has no spirals; considered a transitional form between spirals and elliptical galaxies.
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